Compounds for treating spinal muscular atrophy

ABSTRACT

Provided herein are compounds, compositions thereof and uses therewith for treating spinal muscular atrophy.

CROSS-REFERENCE

This application is a U.S. national stage application of International Patent Application No. PCT/US2013/028131, filed Feb. 28, 2013, which claims the benefit of priority to U.S. Provisional Application Ser. No. 61/605,487, filed Mar. 1, 2012, which is incorporated herein by reference in its entirety and for all purposes.

The technology described herein has not been made with U.S. Government support.

STATEMENT ON JOINT RESEARCH AGREEMENT

The subject matter disclosed was developed and the claimed invention was made by, or on behalf of, one or more parties to a joint research agreement that was in effect on or before the effective filing date of the claimed invention;

-   -   the claimed invention was made as a result of activities         undertaken within the scope of the joint research agreement; and     -   the application for patent for the claimed invention discloses         or is amended to disclose the names of the parties to the joint         research agreement. The parties of the joint research agreement         are PTC Therapeutics, Inc. and F. Hoffmann-La Roche AG.

INTRODUCTION

Provided herein are compounds, compositions thereof and uses therewith for treating Spinal Muscular Atrophy.

BACKGROUND

Spinal muscular atrophy (SMA), in its broadest sense, describes a collection of inherited and acquired central nervous system (CNS) diseases characterized by progressive motor neuron loss in the spinal cord and brainstem causing muscle weakness and muscle atrophy. The most common form of SMA is caused by mutations in the Survival Motor Neuron (SMN) gene and manifests over a wide range of severity affecting infants through adults (Crawford and Pardo, Neurobiol. Dis., 1996, 3:97).

Infantile SMA is the most severe form of this neurodegenerative disorder. Symptoms include muscle weakness, poor muscle tone, weak cry, limpness or a tendency to flop, difficulty sucking or swallowing, accumulation of secretions in the lungs or throat, feeding difficulties, and increased susceptibility to respiratory tract infections. The legs tend to be weaker than the arms and developmental milestones, such as lifting the head or sitting up, cannot be reached. In general, the earlier the symptoms appear, the shorter the lifespan. As the motor neuron cells deteriorate, symptoms appear shortly afterward. The severe forms of the disease are fatal and all forms have no known cure. The course of SMA is directly related to the rate of motor neuron cell deterioration and the resulting severity of weakness. Infants with a severe form of SMA frequently succumb to respiratory disease due to weakness in the muscles that support breathing. Children with milder forms of SMA live much longer, although they may need extensive medical support, especially those at the more severe end of the spectrum. The clinical spectrum of SMA disorders has been divided into the following five groups.

(a) Type 0 SMA (In Utero SMA) is the most severe form of the disease and begins before birth. Usually, the first symptom of Type 0 SMA is reduced movement of the fetus that can first be observed between 30 and 36 weeks of pregnancy. After birth, these newborns have little movement and have difficulties with swallowing and breathing.

(b) Type 1 SMA (Infantile SMA or Werdnig-Hoffmann disease) typically presents symptoms between 0 and 6 months. This form of SMA is also very severe. Patients never achieve the ability to sit, and death usually occurs within the first 2 years without ventilatory support.

(c) Type 2 SMA (Intermediate SMA) has an age of onset at 7-18 months. Patients achieve the ability to sit unsupported, but never stand or walk unaided. Prognosis in this group is largely dependent on the degree of respiratory involvement.

(d) Type 3 SMA (Juvenile SMA or Kugelberg-Welander disease) is generally diagnosed after 18 months. Type 3 SMA individuals are able to walk independently at some point during their disease course but often become wheelchair-bound during youth or adulthood.

(e) Type 4 SMA (Adult onset SMA). Weakness usually begins in late adolescence in the tongue, hands, or feet, then progresses to other areas of the body. The course of adult SMA is much slower and has little or no impact on life expectancy.

The SMN gene has been mapped by linkage analysis to a complex region in chromosome 5q. In humans, this region contains an approximately 500 thousand base pairs (kb) inverted duplication resulting in two nearly identical copies of the SMN gene. SMA is caused by an inactivating mutation or deletion of the telomeric copy of the gene (SMN1) in both chromosomes, resulting in the loss of SMN1 gene function. However, all patients retain the centromeric copy of the gene (SMN2), and the copy number of the SMN2 gene in SMA patients generally correlates inversely with the disease severity; i.e., patients with less severe SMA have more copies of SMN2. Nevertheless, SMN2 is unable to compensate completely for the loss of SMN1 function due to alternative splicing of exon 7 caused by a translationally silent C to T mutation in exon 7. As a result, the majority of transcripts produced from SMN2 lack exon 7 (SMN2Δ7), and encode a truncated Smn protein that has an impaired function and is rapidly degraded.

The Smn protein is thought to play a role in RNA processing and metabolism, having a well characterized function of mediating the assembly of a specific class of RNA-protein complexes termed snRNPs. Smn may have other functions in motor neurons, however its role in preventing the selective degeneration of motor neurons is not well established.

In most cases, SMA is diagnosed based on clinical symptoms and by the absence of all copies of exon 7 in the SMN1 gene, as determined by genetic testing. However, in approximately 5% of cases, SMA is caused by mutations other than a deletion of the entire SMN1 gene or other than a deletion of the entire exon 7 in the SMN1 gene, some known and others not yet defined. In such cases, when the SMN1 gene test is not feasible or the SMN1 gene sequence does not show any abnormality, other tests such as an electromyography (EMG) or muscle biopsy may be indicated.

Medical care for SMA patients at present is limited to supportive therapy including respiratory, nutritional and rehabilitation care; there is no drug known to address the underlying cause of the disease. Current treatment for SMA consists of prevention and management of the secondary effects of chronic motor unit loss. The major management issue in Type 1 SMA is the prevention and early treatment of pulmonary problems, which are the primary cause of death in the majority of the cases. While some infants afflicted with SMA grow to be adults, those with Type 1 SMA have a life expectancy of less than two years.

Several mouse models of SMA have been developed. In particular, the SMNA7 model (Le et al., Hum. Mol. Genet., 2005, 14:845) carries both the SMN2 gene and several copies of the SMN2Δ7 cDNA and recapitulates many of the phenotypic features of Type 1 SMA. The SMNA7 model can be used for both SMN2 expression studies as well as the evaluation of motor function and survival. The C/C-allele mouse model (Jackson Laboratory strain No.: 008714) provides a less severe SMA disease model, with mice having reduced levels of both SMN2 full length (SMN2 FL) mRNA and Smn protein. The C/C-allele mouse phenotype has the SMN2 gene and a hybrid mSmn1-SMN2 gene that undergoes alternative splicing, but does not have overt muscle weakness. The C/C-allele mouse model is used for SMN2 expression studies.

As a result of improved understanding of the genetic basis and pathophysiology of SMA, several strategies for treatment have been explored, but none have yet demonstrated success in the clinic.

Gene replacement of SMN1, using viral delivery vectors, and cell replacement, using differentiated SMN1^(−/−) stem cells, have demonstrated efficacy in animal models of SMA. More research is needed to determine the safety and immune response and to address the requirement for the initiation of treatment at the neonatal stage before these approaches can be applied to humans.

Correction of alternative splicing of SMN2 in cultured cells has also been achieved using synthetic nucleic acids as therapeutic agents: (i) antisense oligonucleotides that target sequence elements in SMN2 pre-mRNA and shift the outcome of the splicing reaction toward the generation of full length SMN2 mRNA (Passini et al., Sci. Transl. Med., 2011, 3:72ra18; and, Hua et al., Nature, 2011, 478:123) and (ii) trans-splicing RNA molecules that provide a fully functional RNA sequence that replace the mutant fragment during splicing and generate a full length SMN1 mRNA (Coady and Lorson, J. Neurosci., 2010, 30:126).

Other approaches under exploration include searching for drugs that increase Smn levels, enhance residual Smn function, or compensate for loss of Smn. Aminoglycosides have been shown to enhance expression of stabilized Smn protein produced from SMN2Δ7 mRNA by promoting the translational read-through of the aberrant stop codon, but have poor central nervous system penetration and are toxic after repeated dosing. Chemotherapeutic agents, such as aclarubicin, have been shown to increase Smn protein in cell culture; however, the toxicity profile of these drugs prohibits long-term use in SMA patients. Some drugs under clinical investigation for the treatment of SMA include transcription activators such as histone deacetylase (“HDAC”) inhibitors (e.g., butyrates, valproic acid, and hydroxyurea), and mRNA stabilizers (mRNA decapping inhibitor RG3039 from Repligen), intended to increase the amount of total RNA transcribed from the SMN2 gene. However, the use of HDAC inhibitors or mRNA stabilizers does not address the underlying cause of SMA and may result in a global increase in transcription and gene expression with potential safety problems in humans.

In an alternative approach, neuroprotective agents such as olesoxime have been chosen for investigation. Such strategies are not aimed at increasing the production of functional Smn for the treatment of SMA, but instead are being explored to protect the Smn-deficient motor neurons from neurodegeneration.

A system designed to identify compounds that increase the inclusion of exon 7 of SMN into RNA transcribed from the SMN2 gene and certain benzooxazole and benzoisoxazole compounds identified thereby have been described in International Application PCT/US2009/003238 filed May 27, 2009 (published as International Publication Number WO2009/151546 and United States Publication Number US2011/0086833). A system designed to identify compounds that produce a stabilized Smn protein from SMN2Δ7 mRNA and certain isoindolinone compounds identified thereby have been described in International Application PCT/US2009/004625 filed Aug. 13, 2009 (published as International Publication Number WO2010/019236 and United States Publication Number US2011/0172284). Each of the foregoing documents is herein incorporated in their entirety and for all purposes.

All other documents referred to herein are incorporated by reference into the present application as though fully set forth herein.

Despite the progress made in understanding the genetic basis and pathophysiology of SMA, there remains a need to identify compounds that alter the course of spinal muscular atrophy, one of the most devastating childhood neurological diseases.

SUMMARY

In one aspect, provided herein are compounds of Formula (I):

-   -   or a form thereof, wherein w₁, w₂, w₃, w₄, w₅ and w₆ are as         defined herein. In one embodiment, provided herein is a         pharmaceutical composition comprising a compound of Formula (I)         or a form thereof, and a pharmaceutically acceptable carrier,         excipient or diluent. In a specific embodiment, provided herein         is a compound of Formula (I) or a form thereof, or a         pharmaceutical composition thereof for treating spinal muscular         atrophy (SMA).

SMA is caused by deletion or mutation of the SMN1 gene, resulting in selective degeneration of Smn-deficient motor neurons. Although human subjects retain several copies of the SMN2 gene, the small amount of functional Smn protein expressed from SMN2 does not fully compensate for the loss of Smn that would have been expressed from the SMN1 gene. The compounds, compositions thereof and uses therewith described herein are based, in part, on the Applicants discovery that a compound of Formula (I) increases the inclusion of exon 7 of SMN2 into mRNA that is transcribed from an SMN2 minigene. The minigene reproduces the alternative splicing reaction of exon 7 of SMN2 which results in exon 7 skipping in the majority of SMN2 transcripts. Thus, compounds of Formula (I) or a form thereof may be used to modulate inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene. Applicants have also discovered that a compound of Formula (I) increases the inclusion of exon 7 of SMN1 into mRNA that is transcribed from an SMN1 minigene. Thus, compounds of Formula (I) or a form thereof may be used to modulate inclusion of exon 7 of SMN1 into mRNA that is transcribed from the SMN1 gene.

In a specific embodiment, provided herein are compounds of Formula (I) or a form thereof that may be used to modulate the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene. In another specific embodiment, provided herein are compounds of Formula (I) or a form thereof that may be used to modulate the inclusion of exon 7 of SMN1 into mRNA that is transcribed from the SMN1 gene. In yet another embodiment, provided herein are compounds of Formula (I) or a form thereof that may be used to modulate the inclusion of exon 7 of SMN1 and SMN2 into mRNA that is transcribed from the SMN1 and SMN2 genes, respectively.

In another aspect, provided herein is the use of a compound of Formula (I) or a form thereof for treating SMA. In a specific embodiment, provided herein is a method for treating SMA in a human subject in need thereof, comprising administering to the subject an effective amount of a compound of Formula (I) or a form thereof. The compound of Formula (I) or a form thereof is preferably administered to a human subject in a pharmaceutical composition. In another specific embodiment, provided herein is the use of a compound of Formula (I) for treating SMA, wherein the compound enhances the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene. Without being limited by theory, compounds of Formula (I) enhance inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene and increase levels of Smn protein produced from the SMN2 gene, and thus can be used to treat SMA in a human subject in need thereof.

In another aspect, provided herein are primers and/or probes described below in the Biological Examples (e.g., SMN primers such as SEQ ID NO. 1, 7, 8, 11 or 13, and/or SEQ ID NO. 2, 9 or 12, and/or SMN probes such as a SEQ ID NO. 3 or 10) and the use of those primers and/or probes. In a specific embodiment, provided herein is an isolated nucleotide sequence comprising SEQ ID NO. 1, 2, 3, 7, 8, 9, 10, 11, 12 or 13. In another specific embodiment, provided herein is an isolated nucleotide sequence consisting essentially of SEQ ID NO. 1, 2, 3, 7, 8, 9, 10, 11, 12 or 13. In another specific embodiment, provided herein is an isolated nucleotide sequence consisting of SEQ ID NO. 1, 2, 3, 7, 8, 9, 10, 11, 12 or 13.

In certain embodiments, the amount of mRNA that is transcribed from the SMN1 gene and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 may be used as a biomarker for SMA, such as disclosed herein. In other embodiments, the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 may be used as a biomarker for treating a patient with a compound, such as disclosed herein. In a specific embodiment, the patient is an SMA patient. In another specific embodiment, the patient is not an SMA patient.

In certain embodiments, the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 as well as the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 may be used as biomarkers for treating a patient with a compound, such as disclosed herein. In a specific embodiment, the patient is an SMA patient. In another specific embodiment, the patient is not an SMA patient.

In accordance with these embodiments, an SMN primer(s) and/or an SMN probe described below may be used in assays, such as PCR (e.g., qPCR), rolling circle amplification, and RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR) to assess and/or quantify the amount of mRNA that is transcribed from the SMN1 gene and/or SMN2 gene and does or does not include exon 7 of SMN1 and/or SMN2.

In a specific embodiment, a primer and/or probe described below in the Biological Examples (e.g., SMN primers such as SEQ ID NO. 1, 7, 8, 11 or 13 and/or SEQ ID NO. 2, 9 or 12, and/or SMN probes such as a SEQ ID NO. 3 or 10) is used in an assay, such as RT-PCR, RT-qPCR, endpoint RT-PCR, PCR, qPCR, rolling circle amplification, Northern blot or Southern blot (e.g., an assay such as described below in the Biological Examples), to determine whether a compound (e.g., a compound of Formula (I) or a form thereof) enhances the inclusion of exon 7 of SMN2 into mRNA that is transcribed from an SMN2 gene.

In a specific embodiment, a primer and/or probe described below in the Biological Examples (e.g., SMN primers such as SEQ ID NO. 1, 7, 8, 11 or 13 and/or SEQ ID NO. 2, 9 or 12, and/or SMN probes such as a SEQ ID NO. 3 or 10) is used in an assay, such as RT-PCR, RT-qPCR, endpoint RT-PCR, PCR, qPCR, rolling circle amplification, Northern blot or Southern blot (e.g., an assay such as described below in the Biological Examples), to determine whether a compound (e.g., a compound of Formula (I) or a form thereof) enhances the inclusion of exon 7 of SMN1 into mRNA that is transcribed from an SMN1 gene.

In a specific embodiment, a primer and/or probe described below in the Biological Examples (e.g., SMN primers such as SEQ ID NO. 1, 7, 8, 11 or 13 and/or SEQ ID NO. 2, 9 or 12, and/or SMN probes such as a SEQ ID NO. 3 or 10) is used in an assay, such as RT-PCR, RT-qPCR, endpoint RT-PCR, PCR, qPCR, rolling circle amplification, Northern blot or Southern blot (e.g., an assay such as described below in the Biological Examples), to determine whether a compound (e.g., a compound of Formula (I) or a form thereof) enhances the inclusion of exon 7 of SMN1 and/or SMN2 into mRNA that is transcribed from an SMN1 and/or SMN2 gene.

In another embodiment, a primer and/or probe described below in the Biological Examples (e.g., SMN primers such as SEQ ID NO. 7, 11 or 13 and/or SEQ ID NO. 9 or 12, and/or SMN probes such as a SEQ ID NO. 3 or 10) is used in an assay, such as RT-PCR, RT-qPCR, endpoint RT-PCR, PCR, qPCR, rolling circle amplification, Northern blot or Southern blot (e.g., an assay such as described below in the Biological Examples), to monitor the amount of mRNA that is transcribed from the SMN2 gene and includes exon 7 of SMN2 in a patient sample. In a specific embodiment, the patient is an SMA patient. In another specific embodiment, the patient is not an SMA patient.

In another embodiment, a primer and/or probe described below in the Biological Examples (e.g., SMN primers such as SEQ ID NO. 7, 11 or 13 and/or SEQ ID NO. 9 or 12, and/or SMN probes such as a SEQ ID NO. 3 or 10) is used in an assay, such as RT-PCR, RT-qPCR, endpoint RT-PCR, PCR, qPCR, rolling circle amplification, Northern blot or Southern blot (e.g., an assay such as described below in the Biological Examples), to monitor the amount of mRNA that is transcribed from the SMN1 gene and includes exon 7 of SMN1 in a patient sample. In a specific embodiment, the patient is an SMA patient. In another specific embodiment, the patient is not an SMA patient.

In another embodiment, a primer and/or probe described below in the Biological Examples (e.g., SMN primers such as SEQ ID NO. 7, 11 or 13 and/or SEQ ID NO. 9 or 12, and/or SMN probes such as a SEQ ID NO. 3 or 10) is used in an assay, such as RT-PCR, RT-qPCR, endpoint RT-PCR, PCR, qPCR, rolling circle amplification, Northern blot or Southern blot (e.g., an assay such as described below in the Biological Examples), to monitor the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in a patient sample. In a specific embodiment, the patient is an SMA patient. In another specific embodiment, the patient is not an SMA patient.

In another embodiment, a primer and/or probe described below in the Biological Examples (e.g., SMN primers such as SEQ ID NO. 7, 8, 11 or 13 and/or SEQ ID NO. 9 or 12, and/or SMN probes such as a SEQ ID NO. 3 or 10) is used in an assay, such as RT-PCR, RT-qPCR, endpoint RT-PCR, PCR, qPCR, rolling circle amplification, Northern blot or Southern blot (e.g., an assay such as described below in the Biological Examples), to monitor a patient's response to a compound (e.g., a compound of Formula (I) or a form thereof). In a specific embodiment, the patient is an SMA patient. In another specific embodiment, the patient is not an SMA patient.

In another embodiment, provided herein is a method for determining whether a compound (e.g., a compound of Formula (I) disclosed herein) enhances the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene, comprising (a) contacting mRNA that is transcribed from an SMN2 minigene described herein or in International Application PCT/US2009/004625, filed Aug. 13, 2009 (published as International Publication Number WO2010/019236) or United States Publication Number US2011/0172284 in the presence of a compound (e.g., a compound of Formula (I) disclosed herein) with a primer(s) described herein (e.g., SEQ ID NO. 1 and/or 2) along with applicable components for, e.g., RT-PCR, RT-qPCR, PCR, endpoint RT-PCR, qPCR or rolling circle amplification; and (b) detecting the amount of mRNA that is transcribed from the minigene and includes exon 7 of the SMN2, wherein (1) an increase in the amount of mRNA that is transcribed from the minigene and includes exon 7 of SMN2 in the presence of the compound relative to the amount of mRNA that is transcribed from the minigene and includes exon 7 of SMN2 in the absence of the compound indicates that the compound enhances inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene; and (2) no change or no substantial change in the amount of mRNA that is transcribed from the minigene and includes exon 7 of SMN2 in the presence of the compound relative to the amount of mRNA that is transcribed from the minigene and includes exon 7 of SMN2 in the absence of the compound indicates that the compound does not enhance the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene.

In another embodiment, provided herein is a method for determining whether a compound (e.g., a compound of Formula (I) disclosed herein) enhances the inclusion of exon 7 of SMN1 into mRNA that is transcribed from the SMN1 gene, comprising (a) contacting mRNA that is transcribed from an SMN1 minigene described in International Application PCT/US2009/004625, filed Aug. 13, 2009 (published as International Publication Number WO2010/019236) or United States Publication Number US2011/0172284 in the presence of a compound (e.g., a compound of Formula (I) disclosed herein) with a primer(s) described herein (e.g., SEQ ID NO. 1 and/or 2) along with applicable components for, e.g., RT-PCR, RT-qPCR, PCR, endpoint RT-PCR, qPCR or rolling circle amplification; and (b) detecting the amount of mRNA that is transcribed from the minigene and includes exon 7 of the SMN1, wherein (1) an increase in the amount of mRNA that is transcribed from the minigene and includes exon 7 of SMN1 in the presence of the compound relative to the amount of mRNA that is transcribed from the minigene and includes exon 7 of SMN1 in the absence of the compound indicates that the compound enhances inclusion of exon 7 of SMN1 into mRNA that is transcribed from the SMN1 gene; and (2) no change or no substantial change in the amount of mRNA that is transcribed from the minigene and includes exon 7 of SMN1 in the presence of the compound relative to the amount of mRNA that is transcribed from the minigene and includes exon 7 of SMN1 in the absence of the compound indicates that the compound does not enhance the inclusion of exon 7 of SMN1 into mRNA that is transcribed from the SMN1 gene.

In another embodiment, provided herein is a method for determining whether a compound (e.g., a compound of Formula (I) disclosed herein) enhances the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene, comprising (a) contacting mRNA that is transcribed from an SMN2 minigene described herein or in International Application PCT/US2009/004625, filed Aug. 13, 2009 (published as International Publication Number WO2010/019236) or United States Publication Number US2011/0172284 in the presence of a compound (e.g., a compound of Formula (I) disclosed herein) with a probe described herein (e.g., SEQ ID NO. 3 or 10) along with applicable components for, e.g., RT-PCR, RT-qPCR, endpoint RT-PCR, PCR, qPCR, rolling circle amplification and, as applicable, Northern blot or Southern blot; and (b) detecting the amount of mRNA that is transcribed from the minigene and includes exon 7 of the SMN2, wherein (1) an increase in the amount of mRNA that is transcribed from the minigene and includes exon 7 of SMN2 in the presence of the compound relative to the amount of mRNA that is transcribed from the minigene and includes exon 7 of SMN2 in the absence of the compound indicates that the compound enhances inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene; and (2) no change or no substantial change in the amount of mRNA that is transcribed from the minigene and includes exon 7 of SMN2 in the presence of the compound relative to the amount of mRNA that is transcribed from the minigene and includes exon 7 of SMN2 in the absence of the compound indicates that the compound does not enhance the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene.

In another embodiment, provided herein is a method for determining whether a compound (e.g., a compound of Formula (I) disclosed herein) enhances the inclusion of exon 7 of SMN1 into mRNA that is transcribed from the SMN1 gene, comprising (a) contacting mRNA that is transcribed from an SMN1 minigene described in International Application PCT/US2009/004625, filed Aug. 13, 2009 (published as International Publication Number WO2010/019236) or United States Publication Number US2011/0172284 in the presence of a compound (e.g., a compound of Formula (I) disclosed herein) with a probe described herein (e.g., SEQ ID NO. 3 or 10) along with applicable components for, e.g., RT-PCR, RT-qPCR, endpoint RT-PCR, PCR, qPCR, rolling circle amplification and, as applicable, Northern blot or Southern blot; and (b) detecting the amount of mRNA that is transcribed from the minigene and includes exon 7 of the SMN1, wherein (1) an increase in the amount of mRNA that is transcribed from the minigene and includes exon 7 of SMN1 in the presence of the compound relative to the amount of mRNA that is transcribed from the minigene and includes exon 7 of SMN1 in the absence of the compound indicates that the compound enhances inclusion of exon 7 of SMN1 into mRNA that is transcribed from the SMN1 gene; and (2) no change or no substantial change in the amount of mRNA that is transcribed from the minigene and includes exon 7 of SMN1 in the presence of the compound relative to the amount of mRNA that is transcribed from the minigene and includes exon 7 of SMN1 in the absence of the compound indicates that the compound does not enhance the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene.

In another embodiment, provided herein is a method for determining whether a compound (e.g., a compound of Formula (I) disclosed herein) enhances the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene, comprising (a) contacting mRNA that is transcribed from an SMN2 minigene described herein or in International Application PCT/US2009/004625, filed Aug. 13, 2009 (published as International Publication Number WO2010/019236) or United States Publication Number US2011/0172284 in the presence of a compound (e.g., a compound of Formula (I) disclosed herein) with a primer(s) (e.g., SEQ ID NO. 1 or 2) and/or a probe described herein (e.g., SEQ ID NO. 3 or 10) along with applicable components for, e.g, RT-PCR, RT-qPCR, endpoint RT-PCR, PCR, qPCR, rolling circle amplification and, as applicable, Northern blot or Southern blot; and (b) detecting the amount of mRNA that is transcribed from the minigene and includes exon 7 of the SMN2, wherein (1) an increase in the amount of mRNA that is transcribed from the minigene and includes exon 7 of SMN2 in the presence of the compound relative to the amount of mRNA that is transcribed from the minigene and includes exon 7 of SMN2 in the absence of the compound indicates that the compound enhances inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene; and (2) no change or no substantial change in the amount of mRNA that is transcribed from the minigene and includes exon 7 of SMN2 in the presence of the compound relative to the amount of mRNA that is transcribed from the minigene and includes exon 7 of SMN2 in the absence of the compound indicates that the compound does not enhance the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene.

In another embodiment, provided herein is a method for determining whether a compound (e.g., a compound of Formula (I) disclosed herein) enhances the inclusion of exon 7 of SMN1 into mRNA that is transcribed from the SMN1 gene, comprising (a) contacting mRNA that is transcribed from an SMN1 minigene described in International Application PCT/US2009/004625, filed Aug. 13, 2009 (published as International Publication Number WO2010/019236) or United States Publication Number US2011/0172284 in the presence of a compound (e.g., a compound of Formula (I) disclosed herein) with a primer(s) (e.g., SEQ ID NO. 1 or 2) and/or a probe described herein (e.g., SEQ ID NO. 3 or 10) along with applicable components for, e.g, RT-PCR, RT-qPCR, endpoint RT-PCR, PCR, qPCR, rolling circle amplification and, as applicable, Northern blot or Southern blot; and (b) detecting the amount of mRNA that is transcribed from the minigene and includes exon 7 of the SMN1, wherein (1) an increase in the amount of mRNA that is transcribed from the minigene and includes exon 7 of SMN1 in the presence of the compound relative to the amount of mRNA that is transcribed from the minigene and includes exon 7 of SMN1 in the absence of the compound indicates that the compound enhances inclusion of exon 7 of SMN1 into mRNA that is transcribed from the SMN1 gene; and (2) no change or no substantial change in the amount of mRNA that is transcribed from the minigene and includes exon 7 of SMN1 in the presence of the compound relative to the amount of mRNA that is transcribed from the minigene and includes exon 7 of SMN1 in the absence of the compound indicates that the compound does not enhance the inclusion of exon 7 of SMN1 into mRNA that is transcribed from the SMN1 gene.

In another aspect, provided herein are kits comprising a primer and/or probe described below in the Biological Examples (e.g., SMN primers such as SEQ ID NO. 1, 7, 8, 11 or 13 and/or SEQ ID NO. 2, 9 or 12, and/or SMN probes such as a SEQ ID NO. 3 or 10) and the use thereof.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1, referenced in Biological Example 1, is a schematic drawing of the SMN2-A minigene construct, which produces two alternatively spliced mRNA transcripts: a full length mRNA that contains exon 7 and a Δ7 mRNA that lacks exon 7. The adenine nucleotide inserted in exon 7 of SMN2-A after nucleic residue 48 is represented by the letter “A.” Alternatively, the nucleotide may also be selected from cytosine or thymine. Due to the insertion of one nucleotide (A, C, or T) after nucleic residue 48, the full length mRNA does not contain a stop codon in the SMN open reading frame, whereas the Δ7 mRNA has a stop codon in Exon 8 that is indicated by the word “Stop.”

FIG. 2, referenced in Biological Example 1, provides the DNA sequence of the minigene from the SMN2-A minigene construct SEQ ID NO. 21 (FIG. 2a ). As shown in FIG. 2b , the following sub-sequences can be found:

-   -   1-70: 5′UTR (deg);     -   71-79: exon 6: start codon and BamHI site (atgggatcc);     -   80-190: exon 6;     -   191-5959: intron 6;     -   5960-6014: exon 7 with the adenine nucleotide “A” insert         (position 6008);     -   6015-6458: intron 7;     -   6459-6481: part of exon 8;     -   6482-8146: BamHI site (sequence at the 5′ end), luciferase         coding sequence starting with codon 2 (without initiation         codon), NotI site (sequence at the 3′ end), TAA stop codon; and     -   8147-8266: 3′UTR (deg).

To generate the SMN1 version of the minigene, the sixth nucleotide of exon 7 (a thymine residue) of the SMN2-A minigene construct is changed to cytosine using site directed mutagenesis. Thus, similar to the SMN2-A minigene construct, the SMN1 minigene construct has a single adenine residue inserted after nucleic residue 48 of exon 7. The SMN1 minigene construct is referred to as SMN1-A. Similarly, the nucleotide inserted in the SMN1 minigene construct after nucleic residue 48 of exon 7 may also be selected alternatively from cytosine or thymine.

FIG. 3, referenced in Biological Example 2, shows the correction of SMN2 minigene alternative splicing in cells treated with rising concentrations of Compound 5 (FIG. 3a ) and Compound 27 (FIG. 3b ) over a 24 hr period. The levels of SMN2 minigene full length mRNA were quantified using reverse transcription-quantitative PCR (RT-qPCR). The level of SMN2 minigene full length mRNA in compound-treated samples was normalized to that in vehicle-treated samples and plotted as a function of the compound concentration.

FIG. 4, referenced in Biological Example 3, shows the correction of SMN2 alternative splicing in Type 1 SMA patient fibroblasts treated with rising concentrations of Compound 5 (FIG. 4a ) and Compound 27 (FIG. 4b ) over a 24 hr period. The levels of SMN2 full length and Δ7 mRNA were quantified using RT-qPCR. The levels of full length and SMN2 Δ7 mRNA in compound-treated samples were normalized to those in vehicle-treated samples and plotted as a function of the compound concentration.

FIG. 5, referenced in Biological Example 4, shows the correction of SMN2 alternative splicing in Type 1 SMA patient fibroblasts treated with rising concentrations of Compound 5 (FIG. 5a ) and Compound 27 (FIG. 5b ) over a 24 hr period. The SMN2 full length and SMN2 Δ7 mRNA were amplified using reverse transcription-end point PCR (RT-PCR) and PCR products were separated using agarose gel electrophoresis. The top and bottom bands correspond to the SMN2 full length and Δ7 mRNA respectively. The intensity of each band is proportional to the amount of RNA present in the sample.

FIG. 6, referenced in Biological Example 7, shows a dose dependent increase in Smn protein expression in Type 1 SMA human fibroblast cells treated over a 48 hour period with Compound 5 (FIG. 6a ) and Compound 27 (FIG. 6b ).

FIG. 7, referenced in Biological Example 8, shows an increase in nuclear speckle counts (gems) in Type 1 SMA patient fibroblasts treated with Compound 5 over a 48 hour period. Speckles were counted using fluorescence microscopy. The number of speckles in compound-treated samples was normalized to that in vehicle-treated samples and plotted as a function of the compound concentration.

FIG. 8, referenced in Biological Example 11, shows increased Smn protein expression in brain, spinal cord, and muscle tissues in a C/C-allele SMA mouse model resulting from treatment for 10 days twice per day (BID) with 50 mg/kg of Compound 5 (n=10). The p value by ANOVA is indicated with three stars (***) for p<0.001.

FIG. 9, referenced in Biological Example 12, shows a dose dependent increase in Smn protein expression in tissues in a neonatal Δ7 SMA mouse model resulting from treatment for 7 days once per day (QD) with Compound 27 (brain, FIG. 9a ; spinal cord, FIG. 9b ; and, muscle, FIG. 9c ). The p value by ANOVA in each Figure is indicated with one star (*) for p<0.05 and three stars (***) for p<0.001.

FIG. 10, referenced in Biological Example 16, shows a dose dependent increase in SMN1 minigene full-length mRNA and a dose dependent decrease in SMN1 minigene Δ7 mRNA in HEK293H human cells treated over a 7 hour period with Compound 5 (FIG. 10a ) and Compound 27 (FIG. 10b ). The SMN1 minigene full length and Δ7 mRNA were each amplified using RT-PCR. The PCR products were separated using agarose gel electrophoresis. The top and bottom bands correspond to the SMN1 minigene full length and Δ7 mRNA, respectively. The intensity of each band is proportional to the amount of RNA present in the sample.

DETAILED DESCRIPTION

Provided herein are compounds of Formula (I):

-   -   or a form thereof, wherein:     -   w₁ is C—R_(b) or N;     -   w₂ and w₆ are independently C—R₁ or C—R₂;     -   w₃, w₄ and w₅ are independently C—R_(a) or N;     -   wherein one of w₂ and w₆ is C—R₁ and the other is C—R₂, provided         that,     -   when w₂ is C—R₁, then w₆ is C—R₂; or, when w₂ is C—R₂, then w₆         is C—R₁; and,     -   wherein one, two or three of w₁, w₃, w₄ and w₅ are independently         N;     -   R₁ is C₁₋₈alkyl, amino, C₁₋₈alkyl-amino, (C₁₋₈alkyl)₂-amino,         C₁₋₈alkoxy-C₁₋₈alkyl-amino, (C₁₋₈alkoxy-C₁₋₈alkyl)₂-amino,         (C₁₋₈alkoxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino, amino-C₁₋₈alkyl,         C₁₋₈alkyl-amino-C₁₋₈alkyl, (C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         C₁₋₈alkoxy-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (C₁₋₈alkoxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (C₁₋₈alkoxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl,         amino-C₁₋₈alkyl-amino, (amino-C₁₋₈alkyl)₂-amino,         (amino-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         C₁₋₈alkyl-amino-C₁₋₈alkyl-amino,         (C₁₋₈alkyl-amino-C₁₋₈alkyl)₂-amino,         (C₁₋₈alkyl-amino-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         (C₁₋₈alkyl)₂-amino-C₁₋₈alkyl-amino,         [(C₁₋₈alkyl)₂-amino-C₁₋₈alkyl](C₁₋₈alkyl)amino,         amino-C₁₋₈alkoxy, C₁₋₈alkyl-amino-C₁₋₈alkoxy,         (C₁₋₈alkyl)₂-amino-C₁₋₈alkoxy,         C₁₋₈alkoxy-C₁₋₈alkyl-amino-C₁₋₈alkoxy,         C₁₋₈alkoxy-C₁₋₈alkyl-amino-C₁₋₈alkoxy,         (C₁₋₈alkoxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkoxy,         amino-C₂₋₈alkenyl, C₁₋₈alkyl-amino-C₂₋₈alkenyl,         (C₁₋₈alkyl)₂-amino-C₂₋₈alkenyl, amino-C₂₋₈alkynyl,         C₁₋₈alkyl-amino-C₂₋₈alkynyl, (C₁₋₈alkyl)₂-amino-C₂₋₈alkynyl,         halo-C₁₋₈alkyl-amino, (halo-C₁₋₈alkyl)₂-amino,         (halo-C₁₋₈alkyl)(C₁₋₈alkyl)amino, hydroxy-C₁₋₈alkyl,         hydroxy-C₁₋₈alkoxy-C₁₋₈alkyl, hydroxy-C₁₋₈alkyl-amino,         (hydroxy-C₁₋₈alkyl)₂-amino, (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl,         hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkoxy,         (hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkoxy,         (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkoxy,         hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl-amino,         (hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl)₂-amino,         (hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl-amino,         (hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl-amino,         [(hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl](C₁₋₈alkyl)amino,         [(hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl](C₁₋₈alkyl)amino,         heterocyclyl, heterocyclyl-C₁₋₈alkyl, heterocyclyl-C₁₋₈alkoxy,         heterocyclyl-amino, (heterocyclyl)(C₁₋₈alkyl)amino,         heterocyclyl-amino-C₁₋₈alkyl, heterocyclyl-C₁₋₈alkyl-amino,         (heterocyclyl-C₁₋₈alkyl)₂-amino,         (heterocyclyl-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         heterocyclyl-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (heterocyclyl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (heterocyclyl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl,         heterocyclyl-oxy, heterocyclyl-carbonyl,         heterocyclyl-carbonyl-oxy, C₃₋₁₄cycloalkyl,         aryl-C₁₋₈alkyl-amino, (aryl-C₁₋₈alkyl)₂-amino,         (aryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         aryl-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (aryl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (aryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl, hetero aryl, hetero         aryl-C₁₋₈alkyl, heteroaryl-C₁₋₈alkoxy, heteroaryl-amino,         heteroaryl-C₁₋₈alkyl-amino, (heteroaryl-C₁₋₈alkyl)₂-amino,         (heteroaryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino, hetero         aryl-C₁₋₈alkyl-amino-C₁₋₈alkyl, (hetero         aryl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl or (hetero         aryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl;     -   wherein, each instance of heterocyclyl, C₃₋₁₄cycloalkyl, aryl         and heteroaryl is optionally substituted with one, two or three         R₃ substituents and optionally, with one additional R₄         substituent; or,     -   wherein, each instance of heterocyclyl, C₃₋₁₄cycloalkyl, aryl         and heteroaryl is optionally substituted with one, two, three or         four R₃ substituents;     -   R₂ is aryl, aryl-amino, aryl-amino-carbonyl, heterocyclyl,         heteroaryl or heteroaryl-amino;     -   wherein, each instance of aryl, heterocyclyl and heteroaryl is         optionally substituted with one, two or three R₆ substituents         and optionally, with one additional R₇ substituent;     -   R_(a) is, in each instance, independently selected from         hydrogen, halogen or C₁₋₈alkyl;     -   R_(b) is hydrogen, halogen, C₁₋₈alkyl or C₁₋₈alkoxy;     -   R₃ is, in each instance, independently selected from cyano,         halogen, hydroxy, oxo, C₁₋₈alkyl, halo-C₁₋₈alkyl,         C₁₋₈alkyl-carbonyl, C₁₋₈alkoxy, halo-C₁₋₈alkoxy,         C₁₋₈alkoxy-C₁₋₈alkyl, C₁₋₈alkoxy-carbonyl, amino,         C₁₋₈alkyl-amino, (C₁₋₈alkyl)₂-amino, amino-C₁₋₈alkyl,         C₁₋₈alkyl-amino-C₁₋₈alkyl, (C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         amino-C₁₋₈alkyl-amino, C₁₋₈alkyl-amino-C₁₋₈alkyl-amino,         (C₁₋₈alkyl-amino-C₁₋₈alkyl)₂-amino,         (C₁₋₈alkyl)₂-amino-C₁₋₈alkyl-amino,         [(C₁₋₈alkyl)₂-amino-C₁₋₈alkyl]₂-amino,         (C₁₋₈alkyl-amino-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         [(C₁₋₈alkyl)₂-amino-C₁₋₈alkyl](C₁₋₈alkyl)amino,         C₁₋₈alkoxy-C₁₋₈alkyl-amino, (C₁₋₈alkoxy-C₁₋₈alkyl)₂-amino,         (C₁₋₈alkoxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         C₁₋₈alkyl-carbonyl-amino, C₁₋₈alkoxy-carbonyl-amino,         hydroxy-C₁₋₈alkyl, hydroxy-C₁₋₈alkoxy-C₁₋₈alkyl,         hydroxy-C₁₋₈alkyl-amino, (hydroxy-C₁₋₈alkyl)₂-amino or         (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino;     -   R₄ is C₃₋₁₄cycloalkyl, C₃₋₁₄cycloalkyl-C₁₋₈alkyl,         C₃₋₁₄cycloalkyl-amino, aryl-C₁₋₈alkyl, aryl-C₁₋₈alkoxy-carbonyl,         aryl-sulfonyloxy-C₁₋₈alkyl, heterocyclyl or         heterocyclyl-C₁₋₈alkyl; wherein, each instance of         C₃₋₁₄cycloalkyl, aryl and heterocyclyl is optionally substituted         with one, two or three R₅ substituents;     -   R₅ is, in each instance, independently selected from halogen,         hydroxy, cyano, nitro, C₁₋₈alkyl, halo-C₁₋₈alkyl, C₁₋₈alkoxy,         halo-C₁₋₈alkoxy, amino, C₁₋₈alkyl-amino, (C₁₋₈alkyl)₂-amino or         C₁₋₈alkyl-thio;     -   R₆ is, in each instance, independently selected from halogen,         hydroxy, cyano, nitro, C₁₋₈alkyl, C₂₋₈alkenyl, halo-C₁₋₈alkyl,         hydroxy-C₁₋₈alkyl, C₁₋₈alkoxy, halo-C₁₋₈alkoxy,         C₁₋₈alkoxy-C₁₋₈alkyl, amino, C₁₋₈alkyl-amino, (C₁₋₈alkyl)₂-amino         or C₁₋₈alkyl-thio; and,     -   R₇ is C₃₋₁₄cycloalkyl, C₃₋₁₄cycloalkyl-oxy, aryl, heterocyclyl         or heteroaryl.

Embodiments

In one embodiment of a compound of Formula (I), w₁ is C—R_(b).

In another embodiment of a compound of Formula (I), w₁ is N.

In one embodiment of a compound of Formula (I), w₃ is C—R_(a).

In another embodiment of a compound of Formula (I), w₃ is N.

In one embodiment of a compound of Formula (I), w₄ is C—R_(a).

In another embodiment of a compound of Formula (I), w₄ is N.

In one embodiment of a compound of Formula (I), w₅ is C—R_(a).

In another embodiment of a compound of Formula (I), w₅ is N.

In one embodiment of a compound of Formula (I), w₂ is C—R₁ and w₆ is C—R₂.

In another embodiment of a compound of Formula (I), w₂ is C—R₂ and w₆ is C—R₁.

In one embodiment of a compound of Formula (I), w₂ is C—R₁, w₆ is C—R₂ and w₃, w₄ and w₅ are independently C—R_(a) or N and w₁ is C—R_(b) or N, wherein one, two or three of w₁, w₃, w₄ and w₅ are simultaneously N.

In another embodiment of a compound of Formula (I), w₂ is C—R₂, w₆ is C—R₁ and w₃, w₄ and w₅ are independently C—R_(a) or N and w₁ is C—R_(b) or N, wherein one, two or three of w₁, w₃, w₄ and w₅ are simultaneously N.

In one embodiment of a compound of Formula (I), w₁ and w₅ are N.

In one embodiment of a compound of Formula (I), w₃ and w₅ are N.

In one embodiment of a compound of Formula (I), w₄ and w₅ are N.

In one embodiment of a compound of Formula (I), w₁, w₃ and w₅ are N.

In one embodiment of a compound of Formula (I), w₁, w₄ and w₅ are N.

In one embodiment of a compound of Formula (I), w₃, w₄ and w₅ are N.

In one embodiment of a compound of Formula (I),

-   -   R₁ is C₁₋₈alkyl, amino, C₁₋₈alkyl-amino, (C₁₋₈alkyl)₂-amino,         C₁₋₈alkoxy-C₁₋₈alkyl-amino, (C₁₋₈alkoxy-C₁₋₈alkyl)₂-amino,         (C₁₋₈alkoxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino, amino-C₁₋₈alkyl,         C₁₋₈alkyl-amino-C₁₋₈alkyl, (C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         C₁₋₈alkoxy-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (C₁₋₈alkoxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (C₁₋₈alkoxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl,         amino-C₁₋₈alkyl-amino, (amino-C₁₋₈alkyl)₂-amino,         (amino-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         C₁₋₈alkyl-amino-C₁₋₈alkyl-amino,         (C₁₋₈alkyl-amino-C₁₋₈alkyl)₂-amino,         (C₁₋₈alkyl-amino-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         (C₁₋₈alkyl)₂-amino-C₁₋₈alkyl-amino,         [(C₁₋₈alkyl)₂-amino-C₁₋₈alkyl](C₁₋₈alkyl)amino,         amino-C₁₋₈alkoxy, C₁₋₈alkyl-amino-C₁₋₈alkoxy,         (C₁₋₈alkyl)₂-amino-C₁₋₈alkoxy,         C₁₋₈alkoxy-C₁₋₈alkyl-amino-C₁₋₈alkoxy,         (C₁₋₈alkoxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkoxy,         (C₁₋₈alkoxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkoxy,         amino-C₂₋₈alkenyl, C₁₋₈alkyl-amino-C₂₋₈alkenyl,         (C₁₋₈alkyl)₂-amino-C₂₋₈alkenyl, amino-C₂₋₈alkynyl,         C₁₋₈alkyl-amino-C₂₋₈alkynyl, (C₁₋₈alkyl)₂-amino-C₂₋₈alkynyl,         halo-C₁₋₈alkyl-amino, (halo-C₁₋₈alkyl)₂-amino,         (halo-C₁₋₈alkyl)(C₁₋₈alkyl)amino, hydroxy-C₁₋₈alkyl,         hydroxy-C₁₋₈alkoxy-C₁₋₈alkyl, hydroxy-C₁₋₈alkyl-amino,         (hydroxy-C₁₋₈alkyl)₂-amino, (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl,         hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkoxy,         (hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkoxy,         (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkoxy,         hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl-amino,         (hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl)₂-amino,         (hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl-amino,         (hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl-amino,         [(hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl](C₁₋₈alkyl)amino,         [(hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl](C₁₋₈alkyl)amino,         heterocyclyl, heterocyclyl-C₁₋₈alkyl, heterocyclyl-C₁₋₈alkoxy,         heterocyclyl-amino, (heterocyclyl)(C₁₋₈alkyl)amino,         heterocyclyl-amino-C₁₋₈alkyl, heterocyclyl-C₁₋₈alkyl-amino,         (heterocyclyl-C₁₋₈alkyl)₂-amino,         (heterocyclyl-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         heterocyclyl-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (heterocyclyl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (heterocyclyl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl,         heterocyclyl-oxy, heterocyclyl-carbonyl,         heterocyclyl-carbonyl-oxy, C₃₋₁₄cycloalkyl,         aryl-C₁₋₈alkyl-amino, (aryl-C₁₋₈alkyl)₂-amino,         (aryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         aryl-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (aryl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (aryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl, heteroaryl, hetero         aryl-C₁₋₈alkyl, heteroaryl-C₁₋₈alkoxy, heteroaryl-amino,         heteroaryl-C₁₋₈alkyl-amino, (heteroaryl-C₁₋₈alkyl)₂-amino,         (heteroaryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino, hetero         aryl-C₁₋₈alkyl-amino-C₁₋₈alkyl, (hetero         aryl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl or         (heteroaryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl; wherein, each         instance of heterocyclyl, C₃₋₁₄cycloalkyl, aryl and heteroaryl         is optionally substituted with R₃ and R₄ substituents.

In another embodiment of a compound of Formula (I),

-   -   R₁ is amino, (C₁₋₈alkyl)₂-amino, C₁₋₈alkoxy-C₁₋₈alkyl-amino,         (C₁₋₈alkoxy-C₁₋₈alkyl)₂-amino, amino-C₁₋₈alkyl,         C₁₋₈alkyl-amino-C₁₋₈alkyl, (C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         C₁₋₈alkoxy-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (C₁₋₈alkoxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (C₁₋₈alkoxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl,         amino-C₁₋₈alkyl-amino, (amino-C₁₋₈alkyl)₂-amino,         (amino-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         C₁₋₈alkyl-amino-C₁₋₈alkyl-amino,         (C₁₋₈alkyl-amino-C₁₋₈alkyl)₂-amino,         (C₁₋₈alkyl-amino-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         (C₁₋₈alkyl)₂-amino-C₁₋₈alkyl-amino,         [(C₁₋₈alkyl)₂-amino-C₁₋₈alkyl](C₁₋₈alkyl)amino,         amino-C₁₋₈alkoxy, C₁₋₈alkyl-amino-C₁₋₈alkoxy,         (C₁₋₈alkyl)₂-amino-C₁₋₈alkoxy,         C₁₋₈alkoxy-C₁₋₈alkyl-amino-C₁₋₈alkoxy,         (C₁₋₈alkoxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkoxy,         (C₁₋₈alkoxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkoxy,         amino-C₂₋₈alkenyl, C₁₋₈alkyl-amino-C₂₋₈alkenyl,         (C₁₋₈alkyl)₂-amino-C₂₋₈alkenyl, amino-C₂₋₈alkynyl,         C₁₋₈alkyl-amino-C₂₋₈alkynyl, (C₁₋₈alkyl)₂-amino-C₂₋₈alkynyl,         halo-C₁₋₈alkyl-amino, (halo-C₁₋₈alkyl)₂-amino,         (halo-C₁₋₈alkyl)(C₁₋₈alkyl)amino, hydroxy-C₁₋₈alkyl,         hydroxy-C₁₋₈alkoxy-C₁₋₈alkyl, hydroxy-C₁₋₈alkyl-amino,         (hydroxy-C₁₋₈alkyl)₂-amino, (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl,         hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkoxy,         (hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkoxy,         (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkoxy,         hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl-amino,         (hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl)₂-amino,         (hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl-amino,         (hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl-amino,         [(hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl](C₁₋₈alkyl)amino,         [(hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl](C₁₋₈alkyl)amino,         heterocyclyl, heterocyclyl-C₁₋₈alkyl, heterocyclyl-C₁₋₈alkoxy,         heterocyclyl-amino, (heterocyclyl)(C₁₋₈alkyl)amino,         heterocyclyl-amino-C₁₋₈alkyl, heterocyclyl-C₁₋₈alkyl-amino,         (heterocyclyl-C₁₋₈alkyl)₂-amino,         (heterocyclyl-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         heterocyclyl-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (heterocyclyl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (heterocyclyl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl,         heterocyclyl-oxy, heterocyclyl-carbonyl,         heterocyclyl-carbonyl-oxy, C₃₋₁₄cycloalkyl,         aryl-C₁₋₈alkyl-amino, (aryl-C₁₋₈alkyl)₂-amino,         (aryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         aryl-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (aryl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (aryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl, hetero aryl, hetero         aryl-C₁₋₈alkyl, hetero aryl-C₁₋₈alkoxy, hetero         aryl-C₁₋₈alkyl-amino, (hetero aryl-C₁₋₈alkyl)₂-amino, (hetero         aryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino, hetero         aryl-C₁₋₈alkyl-amino-C₁₋₈alkyl, (hetero         aryl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl or         (heteroaryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl; wherein, each         instance of heterocyclyl, C₃₋₁₄cycloalkyl, aryl and heteroaryl         is optionally substituted with R₃ and R₄ substituents.

In another embodiment of a compound of Formula (I),

-   -   R₁ is C₁₋₈alkyl, amino, C₁₋₈alkyl-amino, (C₁₋₈alkyl)₂-amino,         C₁₋₈alkoxy-C₁₋₈alkyl-amino, (C₁₋₈alkoxy-C₁₋₈alkyl)₂-amino,         (C₁₋₈alkoxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino, amino-C₁₋₈alkyl,         C₁₋₈alkyl-amino-C₁₋₈alkyl, (C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         C₁₋₈alkoxy-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (C₁₋₈alkoxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (C₁₋₈alkoxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl,         amino-C₁₋₈alkyl-amino, (amino-C₁₋₈alkyl)₂-amino,         (amino-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         C₁₋₈alkyl-amino-C₁₋₈alkyl-amino,         (C₁₋₈alkyl-amino-C₁₋₈alkyl)₂-amino,         (C₁₋₈alkyl-amino-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         (C₁₋₈alkyl)₂-amino-C₁₋₈alkyl-amino,         [(C₁₋₈alkyl)₂-amino-C₁₋₈alkyl](C₁₋₈alkyl)amino,         amino-C₁₋₈alkoxy, C₁₋₈alkyl-amino-C₁₋₈alkoxy,         (C₁₋₈alkyl)₂-amino-C₁₋₈alkoxy,         C₁₋₈alkoxy-C₁₋₈alkyl-amino-C₁₋₈alkoxy,         (C₁₋₈alkoxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkoxy,         (C₁₋₈alkoxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkoxy,         amino-C₂₋₈alkenyl, C₁₋₈alkyl-amino-C₂₋₈alkenyl,         (C₁₋₈alkyl)₂-amino-C₂₋₈alkenyl, amino-C₂₋₈alkynyl,         C₁₋₈alkyl-amino-C₂₋₈alkynyl, (C₁₋₈alkyl)₂-amino-C₂₋₈alkynyl,         halo-C₁₋₈alkyl-amino, (halo-C₁₋₈alkyl)₂-amino,         (halo-C₁₋₈alkyl)(C₁₋₈alkyl)amino, hydroxy-C₁₋₈alkyl,         hydroxy-C₁₋₈alkoxy-C₁₋₈alkyl, hydroxy-C₁₋₈alkyl-amino,         (hydroxy-C₁₋₈alkyl)₂-amino, (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl,         hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkoxy,         (hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkoxy,         (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkoxy,         hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl-amino,         (hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl)₂-amino,         (hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl-amino,         (hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl-amino,         [(hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl](C₁₋₈alkyl)amino or         [(hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl](C₁₋₈alkyl)amino.

In another embodiment of a compound of Formula (I),

-   -   R₁ is heterocyclyl, heterocyclyl-C₁₋₈alkyl,         heterocyclyl-C₁₋₈alkoxy, heterocyclyl-amino,         (heterocyclyl)(C₁₋₈alkyl)amino, heterocyclyl-amino-C₁₋₈alkyl,         heterocyclyl-C₁₋₈alkyl-amino, (heterocyclyl-C₁₋₈alkyl)₂-amino,         (heterocyclyl-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         heterocyclyl-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (heterocyclyl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (heterocyclyl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl,         heterocyclyl-oxy, heterocyclyl-carbonyl,         heterocyclyl-carbonyl-oxy, C₃₋₁₄cycloalkyl,         aryl-C₁₋₈alkyl-amino, (aryl-C₁₋₈alkyl)₂-amino,         (aryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         aryl-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (aryl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (aryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl, heteroaryl,         heteroaryl-C₁₋₈alkyl, heteroaryl-C₁₋₈alkoxy, heteroaryl-amino,         heteroaryl-C₁₋₈alkyl-amino, (heteroaryl-C₁₋₈alkyl)₂-amino,         (heteroaryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino, hetero         aryl-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (heteroaryl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl or         (heteroaryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl; wherein, each         instance of heterocyclyl, C₃₋₁₄cycloalkyl, aryl and heteroaryl         is optionally substituted with R₃ and R₄ substituents.

In another embodiment of a compound of Formula (I),

-   -   R₁ is heterocyclyl, heterocyclyl-C₁₋₈alkyl,         heterocyclyl-C₁₋₈alkoxy, heterocyclyl-amino,         (heterocyclyl)(C₁₋₈alkyl)amino, heterocyclyl-amino-C₁₋₈alkyl,         heterocyclyl-C₁₋₈alkyl-amino, (heterocyclyl-C₁₋₈alkyl)₂-amino,         (heterocyclyl-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         heterocyclyl-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (heterocyclyl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (heterocyclyl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl,         heterocyclyl-oxy, heterocyclyl-carbonyl or         heterocyclyl-carbonyl-oxy; wherein, each instance of         heterocyclyl is optionally substituted with R₃ and R₄         substituents.

In another embodiment of a compound of Formula (I), R₁ is heterocyclyl optionally substituted with R₃ and R₄ substituents.

In another embodiment of a compound of Formula (I), R₁ is C₃₋₁₄cycloalkyl optionally substituted with R₃ and R₄ substituents.

In another embodiment of a compound of Formula (I),

-   -   R₁ is aryl-C₁₋₈alkyl-amino, (aryl-C₁₋₈alkyl)₂-amino,         (aryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         aryl-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (aryl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl or         (aryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl; wherein, each         instance of aryl is optionally substituted with R₃ and R₄         substituents.

In another embodiment of a compound of Formula (I), R₁ is aryl-C₁₋₈alkyl-amino optionally substituted with R₃ and R₄ substituents.

In another embodiment of a compound of Formula (I),

-   -   R₁ is heteroaryl, heteroaryl-C₁₋₈alkyl, heteroaryl-C₁₋₈alkoxy,         heteroaryl-amino, heteroaryl-C₁₋₈alkyl-amino,         (heteroaryl-C₁₋₈alkyl)₂-amino,         (heteroaryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino, hetero         aryl-C₁₋₈alkyl-amino-C₁₋₈alkyl, (hetero         aryl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl or         (heteroaryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl; wherein, each         instance of heterocyclyl, C₃₋₁₄cycloalkyl, aryl and heteroaryl         is optionally substituted with R₃ and R₄ substituents.

In another embodiment of a compound of Formula (I), R₁ is heteroaryl optionally substituted with R₃ and R₄ substituents.

In one embodiment of a compound of Formula (I),

-   -   R₁ is heterocyclyl selected from azetidinyl, tetrahydrofuranyl,         pyrrolidinyl, piperidinyl, piperazinyl, 1,4-diazepanyl,         1,2,5,6-tetrahydropyridinyl, 1,2,3,6-tetrahydropyridinyl,         hexahydropyrrolo[3,4-b]pyrrol-(1H)-yl,         (3aS,6aS)-hexahydropyrrolo[3,4-b]pyrrol-(1H)-yl,         (3aR,6aR)-hexahydropyrrolo[3,4-b]pyrrol-(1H)-yl,         hexahydropyrrolo[3,4-b]pyrrol-(2H)-yl,         (3aS,6aS)-hexahydropyrrolo[3,4-b]pyrrol-(2H)-yl,         hexahydropyrrolo[3,4-c]pyrrol-(1H)-yl,         (3aR,6aS)-hexahydropyrrolo[3,4-c]pyrrol-(1H)-yl,         octahydro-5H-pyrrolo[3,2-c]pyridinyl,         octahydro-6H-pyrrolo[3,4-b]pyridinyl,         (4aR,7aR)-octahydro-6H-pyrrolo[3,4-b]pyridinyl,         (4aS,7aS)-octahydro-6H-pyrrolo[3,4-b]pyridinyl,         hexahydropyrrolo[1,2-a]pyrazin-(2H)-one,         hexahydropyrrolo[1,2-a]pyrazin-(1H)-yl,         (7R,8aS)-hexahydropyrrolo[1,2-a]pyrazin-(1H)-yl,         (8aS)-hexahydropyrrolo[1,2-a]pyrazin-(1H)-yl,         (8aR)-hexahydropyrrolo[1,2-a]pyrazin-(1H)-yl,         (8aS)-octahydropyrrolo[1,2-a]pyrazin-(1H)-yl,         (8aR)-octahydropyrrolo[1,2-a]pyrazin-(1H)-yl,         octahydro-2H-pyrido[1,2-a]pyrazinyl, 3-azabicyclo[3.1.0]hexyl,         (1R,5S)-3-azabicyclo[3.1.0]hexyl, 8-azabicyclo[3.2.1]octyl,         (1R,5S)-8-azabicyclo[3.2.1]octyl, 8-azabicyclo[3.2.1]oct-2-enyl,         (1R,5S)-8-azabicyclo[3.2.1]oct-2-enyl, 9-azabicyclo[3.3.1]nonyl,         (1R,5S)-9-azabicyclo[3.3.1]nonyl, 2,5-diazabicyclo[2.2.1]heptyl,         (1S,4S)-2,5-diazabicyclo[2.2.1]heptyl,         2,5-diazabicyclo[2.2.2]octyl, 3,8-diazabicyclo[3.2.1]octyl,         (1R,5S)-3,8-diazabicyclo[3.2.1]octyl,         1,4-diazabicyclo[3.2.2]nonyl, azaspiro[3.3]heptyl,         2,6-diazaspiro[3.3]heptyl, 2,7-diazaspiro[3.5]nonyl,         5,8-diazaspiro[3.5]nonyl, 2,7-diazaspiro[4.4]nonyl or         6,9-diazaspiro[4.5]decyl; wherein, each instance of heterocyclyl         is optionally substituted with R₃ and R₄ substituents.

In another embodiment of a compound of Formula (I),

-   -   R₁ is heterocyclyl selected from azetidin-1-yl,         tetrahydrofuran-3-yl, pyrrolidin-1-yl, piperidin-1-yl,         piperidin-4-yl, piperazin-1-yl, 1,4-diazepan-1-yl,         1,2,5,6-tetrahydropyridin-5-yl, 1,2,3,6-tetrahydropyridin-4-yl,         hexahydropyrrolo[3,4-b]pyrrol-1(2H)-yl,         (3aS,6aS)-hexahydropyrrolo[3,4-b]pyrrol-1(2H)-yl,         (3aS,6aS)-hexahydropyrrolo[3,4-b]pyrrol-5(1H)-yl,         (3aR,6aR)-hexahydropyrrolo[3,4-b]pyrrol-5(1H)-yl,         hexahydropyrrolo[3,4-c]pyrrol-2(1H)-yl,         (3aR,6aS)-hexahydropyrrolo[3,4-c]pyrrol-2(1H)-yl,         octahydro-5H-pyrrolo[3,2-c]pyridin-5-yl,         octahydro-6H-pyrrolo[3,4-b]pyridin-6-yl,         (4aR,7aR)-octahydro-6H-pyrrolo[3,4-b]pyridin-6-yl,         (4aS,7aS)-octahydro-6H-pyrrolo[3,4-b]pyridin-6-yl,         hexahydropyrrolo[1,2-a]pyrazin-6(2H)-one,         hexahydropyrrolo[1,2-a]pyrazin-2(1H)-yl,         (7R,8aS)-hexahydropyrrolo[1,2-a]pyrazin-2(1H)-yl,         (8aS)-hexahydropyrrolo[1,2-a]pyrazin-2(1H)-yl,         (8aR)-hexahydropyrrolo[1,2-a]pyrazin-2(1H)-yl,         (8aS)-octahydropyrrolo[1,2-a]pyrazin-2(1H)-yl,         (8aR)-octahydropyrrolo[1,2-a]pyrazin-2(1H)-yl,         octahydro-2H-pyrido[1,2-a]pyrazin-2-yl,         3-azabicyclo[3.1.0]hex-3-yl, 8-azabicyclo[3.2.1]oct-3-yl,         (1R,5S)-8-azabicyclo[3.2.1]oct-3-yl,         8-azabicyclo[3.2.1]oct-2-en-3-yl,         (1R,5S)-8-azabicyclo[3.2.1]oct-2-en-3-yl,         9-azabicyclo[3.3.1]non-3-yl,         (1R,5S)-9-azabicyclo[3.3.1]non-3-yl,         2,5-diazabicyclo[2.2.1]hept-2-yl,         (1S,4S)-2,5-diazabicyclo[2.2.1]hept-2-yl,         2,5-diazabicyclo[2.2.2]oct-2-yl,         3,8-diazabicyclo[3.2.1]oct-3-yl,         (1R,5S)-3,8-diazabicyclo[3.2.1]oct-3-yl,         1,4-diazabicyclo[3.2.2]non-4-yl, azaspiro[3.3]hept-2-yl,         2,6-diazaspiro[3.3]hept-2-yl, 2,7-diazaspiro[3.5]non-7-yl,         5,8-diazaspiro[3.5]non-8-yl, 2,7-diazaspiro[4.4]non-2-yl or         6,9-diazaspiro[4.5]dec-9-yl; wherein, each instance of         heterocyclyl is optionally substituted with R₃ and R₄         substituents.

In another embodiment of a compound of Formula (I),

-   -   R₁ is substituted heterocyclyl selected from         4-methyl-1,4-diazepan-1-yl,         (3aS,6aS)-1-methylhexahydropyrrolo[3,4-b]pyrrol-5(1H)-yl,         (3aS,6aS)-5-methylhexahydropyrrolo[3,4-b]pyrrol-1(2H)-yl,         (3aR,6aR)-1-methylhexahydropyrrolo[3,4-b]pyrrol-5(1H)-yl,         (3aR,6aS)-5-methylhexahydropyrrolo[3,4-c]pyrrol-2(1H)-yl,         (3aR,6aS)-5-(2-hydroxyethyl)hexahydropyrrolo[3,4-c]pyrrol-2(1H)-yl,         (3aR,6aS)-5-(propan-2-yl)hexahydropyrrolo[3,4-c]pyrrol-2(1H)-yl,         (3aR,6aS)-5-ethylhexahydropyrrolo[3,4-c]pyrrol-2(1H)-yl,         (4aR,7aR)-1-methyloctahydro-6H-pyrrolo[3,4-b]pyridin-6-yl,         (4aR,7aR)-1-ethyloctahydro-6H-pyrrolo[3,4-b]pyridin-6-yl,         (4aR,7aR)-1-(2-hydroxyethyl)octahydro-6H-pyrrolo[3,4-b]pyridin-6-yl,         (4aS,7aS)-1-methyloctahydro-6H-pyrrolo[3,4-b]pyridin-6-yl,         (4aS,7aS)-1-(2-hydroxyethyl)octahydro-6H-pyrrolo[3,4-b]pyridin-6-yl,         (7R,8aS)-7-hydroxyhexahydropyrrolo[1,2-a]pyrazin-2(1H)-yl,         (8aS)-8a-methyloctahydropyrrolo[1,2-a]pyrazin-2(1H)-yl,         (8aR)-8a-methyloctahydropyrrolo[1,2-a]pyrazin-2(1H)-yl,         (1R,5S,6s)-6-(dimethylamino)-3-azabicyclo[3.1.0]hex-3-yl,         (1R,5S)-8-methyl-8-azabicyclo[3.2.1]oct-3-yl,         9-methyl-9-azabicyclo[3.3.1]non-3-yl,         (3-exo)-9-methyl-9-azabicyclo[3.3.1]non-3-yl,         (1R,5S)-9-methyl-9-azabicyclo[3.3.1]non-3-yl,         (1S,4S)-5-methyl-2,5-diazabicyclo[2.2.1]hept-2-yl or         (1S,4S)-5-ethyl-2,5-diazabicyclo[2.2.1]hept-2-yl.

In one embodiment of a compound of Formula (I), R₁ is heterocyclyl-C₁₋₈alkyl, wherein heterocyclyl is selected from morpholinyl, piperidinyl, piperazinyl, imidazolyl or pyrrolidinyl; and, wherein, each instance of heterocyclyl is optionally substituted with R₃ and R₄ substituents.

In another embodiment of a compound of Formula (I), R₁ is heterocyclyl-C₁₋₈alkyl selected from morpholin-4-yl-methyl, morpholin-4-yl-ethyl, morpholin-4-yl-propyl, piperidin-1-yl-methyl, piperazin-1-yl-methyl, piperazin-1-yl-ethyl, piperazin-1-yl-propyl, piperazin-1-yl-butyl, imidazol-1-yl-methyl, imidazol-1-yl-ethyl, imidazol-1-yl-propyl, imidazol-1-yl-butyl, pyrrolidin-1-yl-methyl, pyrrolidin-1-yl-ethyl, pyrrolidin-1-yl-propyl or pyrrolidin-1-yl-butyl; wherein, each instance of heterocyclyl is optionally substituted with R₃ and R₄ substituents.

In one embodiment of a compound of Formula (I), R₁ is heterocyclyl-C₁₋₈alkoxy, wherein heterocyclyl is selected from pyrrolidinyl, piperidinyl or morpholinyl; and, wherein, each instance of heterocyclyl is optionally substituted with R₃ and R₄ substituents.

In another embodiment of a compound of Formula (I), R₁ is heterocyclyl-C₁₋₈alkoxy selected from pyrrolidin-2-yl-methoxy, pyrrolidin-2-yl-ethoxy, pyrrolidin-1-yl-methoxy, pyrrolidin-1-yl-ethoxy, piperidin-1-yl-methoxy, piperidin-1-yl-ethoxy, morpholin-4-yl-methoxy or morpholin-4-yl-ethoxy; wherein, each instance of heterocyclyl is optionally substituted with R₃ and R₄ substituents.

In one embodiment of a compound of Formula (I), R₁ is heterocyclyl-amino, wherein heterocyclyl is selected from azetidinyl, pyrrolidinyl, piperidinyl, 9-azabicyclo[3.3.1]nonyl or (1R,5S)-9-azabicyclo[3.3.1]nonyl; and, wherein, each instance of heterocyclyl is optionally substituted with R₃ and R₄ substituents.

In another embodiment of a compound of Formula (I), R₁ is heterocyclyl-amino selected from azetidin-3-yl-amino, pyrrolidin-3-yl-amino, piperidin-4-yl-amino, 9-azabicyclo[3.3.1]non-3-yl-amino, (1R,5S)-9-azabicyclo[3.3.1]non-3-yl-amino, 9-methyl-9-azabicyclo[3.3.1]non-3-yl-amino, (3-exo)-9-methyl-9-azabicyclo[3.3.1]non-3-yl-amino or (1R,5S)-9-methyl-9-azabicyclo[3.3.1]non-3-yl-amino; wherein, each instance of heterocyclyl is optionally substituted with R₃ and R₄ substituents.

In one embodiment of a compound of Formula (I), R₁ is (heterocyclyl)(C₁₋₈alkyl)amino, wherein heterocyclyl is selected from pyrrolidinyl or piperidinyl; and, wherein, each instance of heterocyclyl is optionally substituted with R₃ and R₄ substituents.

In another embodiment of a compound of Formula (I), R₁ is (heterocyclyl)(C₁₋₈alkyl)amino selected from (pyrrolidin-3-yl)(methyl)amino or (piperidin-4-yl)(methyl)amino; wherein, each instance of heterocyclyl is optionally substituted with R₃ and R₄ substituents.

In one embodiment of a compound of Formula (I), R₁ is heterocyclyl-amino-C₁₋₈alkyl, wherein heterocyclyl is selected from tetrahydrofuranyl; and, wherein, each instance of heterocyclyl is optionally substituted with R₃ and R₄ substituents.

In another embodiment of a compound of Formula (I), R₁ is heterocyclyl-amino-C₁₋₈alkyl, selected from 3-(tetrahydrofuran-3-yl-amino)propyl; wherein, each instance of heterocyclyl is optionally substituted with R₃ and R₄ substituents.

In one embodiment of a compound of Formula (I), R₁ is heterocyclyl-C₁₋₈alkyl-amino-C₁₋₈alkyl, wherein heterocyclyl is selected from tetrahydrofuranyl, thienyl or pyridinyl; and, wherein, each instance of heterocyclyl is optionally substituted with R₃ and R₄ substituents.

In another embodiment of a compound of Formula (I), R₁ is heterocyclyl-C₁₋₈alkyl-amino-C₁₋₈alkyl, selected from 3-[(tetrahydrofuran-2-ylmethyl)amino]propyl, 3-[(thienyl-3-ylmethyl)amino]propyl, 3-[(pyridin-2-ylmethyl)amino]propyl or 3-[(pyridin-4-ylmethyl)amino]propyl; wherein, each instance of heterocyclyl is optionally substituted with R₃ and R₄ substituents.

In one embodiment of a compound of Formula (I), R₁ is heterocyclyl-oxy, wherein heterocyclyl is selected from pyrrolidinyl or piperidinyl; and, wherein, each instance of heterocyclyl is optionally substituted with R₃ and R₄ substituents.

In another embodiment of a compound of Formula (I), R₁ is heterocyclyl-oxy selected from pyrrolidin-3-yl-oxy or piperidin-4-yl-oxy; wherein, each instance of heterocyclyl is optionally substituted with R₃ and R₄ substituents.

In one embodiment of a compound of Formula (I), R₁ is heterocyclyl-carbonyl, wherein heterocyclyl is selected from piperazinyl; and, wherein, each instance of heterocyclyl is optionally substituted with R₃ and R₄ substituents.

In another embodiment of a compound of Formula (I), R₁ is heterocyclyl-carbonyl selected from piperazin-1-yl-carbonyl; wherein, each instance of heterocyclyl is optionally substituted with R₃ and R₄ substituents.

In one embodiment of a compound of Formula (I), R₁ is heterocyclyl-carbonyl-oxy, wherein heterocyclyl is selected from piperazinyl; and, wherein, each instance of heterocyclyl is optionally substituted with R₃ and R₄ substituents.

In another embodiment of a compound of Formula (I), R₁ is heterocyclyl-carbonyl-oxy selected from piperazin-1-yl-carbonyl-oxy; wherein, each instance of heterocyclyl is optionally substituted with R₃ and R₄ substituents.

In one embodiment of a compound of Formula (I), R₁ is C₃₋₁₄cycloalkyl selected from cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cyclohexenyl or cycloheptyl; wherein, each instance of C₃₋₁₄cycloalkyl is optionally substituted with R₃ and R₄ substituents.

In another embodiment of a compound of Formula (I), R₁ is C₃₋₈cycloalkyl selected from cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cyclohexenyl or cycloheptyl; wherein, each instance of C₃₋₈cycloalkyl is optionally substituted with R₃ and R₄ substituents.

In one embodiment of a compound of Formula (I), R₁ is aryl-C₁₋₈alkyl-amino-C₁₋₈alkyl, wherein aryl is selected from phenyl; and, wherein, each instance of aryl is optionally substituted with R₃ and R₄ substituents.

In another embodiment of a compound of Formula (I), R₁ is aryl-C₁₋₈alkyl-amino-C₁₋₈alkyl selected from 3-(benzylamino)propyl; wherein, each instance of aryl is optionally substituted with R₃ and R₄ substituents.

In one embodiment of a compound of Formula (I), R₁ is heteroaryl, wherein heteroaryl is selected from pyridinyl; and, wherein, each instance of heteroaryl is optionally substituted with R₃ and R₄ substituents.

In another embodiment of a compound of Formula (I), R₁ is heteroaryl selected from pyridin-4-yl; wherein, each instance of heteroaryl is optionally substituted with R₃ and R₄ substituents.

In one embodiment of a compound of Formula (I), R₁ is heteroaryl-C₁₋₈alkyl, wherein heteroaryl is selected from 1H-imidazolyl; and, wherein, each instance of heteroaryl is optionally substituted with R₃ and R₄ substituents.

In another embodiment of a compound of Formula (I), R₁ is heteroaryl-C₁₋₈alkyl selected from 1H-imidazol-1-yl-methyl; wherein, each instance of heteroaryl is optionally substituted with R₃ and R₄ substituents.

In one embodiment of a compound of Formula (I), R₁ is (heteroaryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino, wherein heteroaryl is selected from pyridinyl; and, wherein, each instance of heteroaryl is optionally substituted with R₃ and R₄ substituents.

In another embodiment of a compound of Formula (I), R₁ is (heteroaryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino selected from (pyridin-3-ylmethyl)(methyl)amino; wherein, each instance of heteroaryl is optionally substituted with R₃ and R₄ substituents.

In one embodiment of a compound of Formula (I), R₁ is heteroaryl-C₁₋₈alkyl-amino-C₁₋₈alkyl, wherein heteroaryl is selected from thienyl or pyridinyl; and, wherein, each instance of heteroaryl is optionally substituted with R₃ and R₄ substituents.

In another embodiment of a compound of Formula (I), R₁ is heteroaryl-C₁₋₈alkyl-amino-C₁₋₈alkyl selected from thien-3-yl-methyl-amino-propyl, pyridin-2-yl-methyl-amino-propyl, pyridin-3-yl-methyl-amino-propyl or pyridin-4-yl-methyl-amino-propyl; wherein, each instance of heteroaryl is optionally substituted with R₃ and R₄ substituents.

In one embodiment of a compound of Formula (I), R₃ is selected from cyano, halogen, hydroxy, oxo, C₁₋₈alkyl, halo-C₁₋₈alkyl, C₁₋₈alkyl-carbonyl, C₁₋₈alkoxy, halo-C₁₋₈alkoxy, C₁₋₈alkoxy-C₁₋₈alkyl, C₁₋₈alkoxy-carbonyl, amino, C₁₋₈alkyl-amino, (C₁₋₈alkyl)₂-amino, amino-C₁₋₈alkyl, C₁₋₈alkyl-amino-C₁₋₈alkyl, (C₁₋₈alkyl)₂-amino-C₁₋₈alkyl, amino-C₁₋₈alkyl-amino, C₁₋₈alkyl-amino-C₁₋₈alkyl-amino, (C₁₋₈alkyl)₂-amino-C₁₋₈alkyl-amino, C₁₋₈alkoxy-C₁₋₈alkyl-amino, C₁₋₈alkyl-carbonyl-amino, C₁₋₈alkoxy-carbonyl-amino, hydroxy-C₁₋₈alkyl, hydroxy-C₁₋₈alkoxy-C₁₋₈alkyl, hydroxy-C₁₋₈alkyl-amino, (hydroxy-C₁₋₈alkyl)₂-amino or (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino.

In another embodiment of a compound of Formula (I), R₃ is selected from cyano, halogen, hydroxy, oxo, C₁₋₈alkyl, halo-C₁₋₈alkyl, C₁₋₈alkoxy, C₁₋₈alkoxy-C₁₋₈alkyl, C₁₋₈alkoxy-carbonyl, amino, C₁₋₈alkyl-amino, (C₁₋₈alkyl)₂-amino, amino-C₁₋₈alkyl, C₁₋₈alkyl-amino-C₁₋₈alkyl, (C₁₋₈alkyl)₂-amino-C₁₋₈alkyl, C₁₋₈alkyl-amino-C₁₋₈alkyl-amino, C₁₋₈alkoxy-C₁₋₈alkyl-amino, C₁₋₈alkoxy-carbonyl-amino, hydroxy-C₁₋₈alkyl, hydroxy-C₁₋₈alkoxy-C₁₋₈alkyl, hydroxy-C₁₋₈alkyl-amino, (hydroxy-C₁₋₈alkyl)₂-amino or (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino.

In one embodiment of a compound of Formula (I), R₃ is C₁₋₈alkyl selected from methyl, ethyl, propyl, isopropyl or tert-butyl.

In another embodiment of a compound of Formula (I), R₃ is C₁₋₈alkyl selected from ethyl, propyl, isopropyl or tert-butyl.

In one embodiment of a compound of Formula (I), R₃ is halo-C₁₋₈alkyl selected from trihalo-methyl, dihalo-methyl, halo-methyl, trihalo-ethyl, dihalo-ethyl, halo-ethyl, trihalo-propyl, dihalo-propyl or halo-propyl; wherein, halo is selected from fluoro, chloro, bromo or iodo.

In another embodiment of a compound of Formula (I), R₃ is halo-C₁₋₈alkyl selected from trihalo-methyl, dihalo-methyl, halo-methyl, trihalo-ethyl, dihalo-ethyl, trihalo-propyl or dihalo-propyl; wherein, halo is selected from fluoro, chloro, bromo or iodo.

In one embodiment of a compound of Formula (I), R₃ is hydroxy-C₁₋₈alkyl selected from hydroxy-methyl, hydroxy-ethyl, hydroxy-propyl, dihydroxy-propyl, hydroxy-butyl or dihydroxy-butyl.

In another embodiment of a compound of Formula (I), R₃ is hydroxy-C₁₋₈alkyl selected from hydroxy-methyl, dihydroxy-propyl, hydroxy-butyl or dihydroxy-butyl.

In one embodiment of a compound of Formula (I), R₃ is C₁₋₈alkoxy selected from methoxy, ethoxy, propoxy or isopropoxy.

In one embodiment of a compound of Formula (I), R₃ is halo-C₁₋₈alkoxy selected from trihalo-methoxy, dihalo-methoxy, halo-methoxy, trihalo-ethoxy, dihalo-ethoxy, halo-ethoxy, trihalo-propoxy, dihalo-propoxy or halo-propoxy; wherein, halo is selected from fluoro, chloro, bromo or iodo.

In one embodiment of a compound of Formula (I), R₃ is C₁₋₈alkoxy-carbonyl-amino selected from methoxy-carbonyl-amino, ethoxy-carbonyl-amino, propoxy-carbonyl-amino, isopropoxy-carbonyl-amino, tert-butoxy-carbonyl-amino.

In one embodiment of a compound of Formula (I), R₄ is C₃₋₁₄cycloalkyl selected from cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl or cycloheptyl; wherein, each instance of C₃₋₁₄cycloalkyl is optionally substituted with R₅ substituents.

In another embodiment of a compound of Formula (I), R₄ is C₃₋₈cycloalkyl selected from cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl or cycloheptyl; wherein, each instance of C₃₋₈cycloalkyl is optionally substituted with R₅ substituents.

In one embodiment of a compound of Formula (I), R₄ is C₃₋₁₄cycloalkyl-C₁₋₈alkyl, wherein C₃₋₁₄cycloalkyl is selected from cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl or cycloheptyl; and, wherein, each instance of C₃₋₁₄cycloalkyl is optionally substituted with R₅ substituents.

In another embodiment of a compound of Formula (I), R₄ is C₃₋₈cycloalkyl-C₁₋₈alkyl, wherein C₃₋₈cycloalkyl is selected from cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl or cycloheptyl; and, wherein, each instance of C₃₋₈cycloalkyl is optionally substituted with R₅ substituents.

In one embodiment of a compound of Formula (I), R₄ is C₃₋₁₄cycloalkyl-amino, wherein C₃₋₁₄cycloalkyl is selected from cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl or cycloheptyl; and, wherein, each instance of C₃₋₁₄cycloalkyl is optionally substituted with R₅ substituents.

In another embodiment of a compound of Formula (I), R₄ is C₃₋₈cycloalkyl-amino, wherein C₃₋₈cycloalkyl is selected from cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl or cycloheptyl; and, wherein, each instance of C₃₋₈cycloalkyl is optionally substituted with R₅ substituents.

In one embodiment of a compound of Formula (I), R₄ is aryl-C₁₋₈alkyl, aryl-C₁₋₈alkoxy-carbonyl or aryl-sulfonyloxy-C₁₋₈alkyl, wherein aryl is selected from phenyl; and, wherein, each instance of aryl is optionally substituted with R₅ substituents.

In another embodiment of a compound of Formula (I), R₄ is aryl-C₁₋₈alkyl or aryl-C₁₋₈alkoxy-carbonyl, wherein each instance of aryl is optionally substituted with R₅ substituents.

In one embodiment of a compound of Formula (I), R₄ is heterocyclyl selected from oxetanyl, pyrrolidinyl, piperidinyl, piperazinyl, 1,3-dioxanyl or morpholinyl, wherein each instance of heterocyclyl is optionally substituted with R₅ substituents.

In another embodiment of a compound of Formula (I), R₄ is heterocyclyl selected from oxetan-3-yl, pyrrolidin-1-yl, piperidin-1-yl, piperazin-1-yl, 1,3-dioxan-5-yl or morpholin-4-yl, wherein each instance of heterocyclyl is optionally substituted with R₅ substituents.

In one embodiment of a compound of Formula (I), R₄ is heterocyclyl-C₁₋₈alkyl, wherein each instance of heterocyclyl is selected from pyrrolidinyl or piperidinyl; and, wherein, each instance of heterocyclyl is optionally substituted with R₅ substituents.

In another embodiment of a compound of Formula (I), R₄ is heterocyclyl-C₁₋₈alkyl selected from pyrrolidin-1-yl-C₁₋₈alkyl or piperidin-1-yl-C₁₋₈alkyl, wherein each instance of heterocyclyl is optionally substituted with R₅ substituents.

In one embodiment of a compound of Formula (I), R₅ is selected from halogen, hydroxy, cyano, nitro, halo-C₁₋₈alkyl, C₁₋₈alkoxy, halo-C₁₋₈alkoxy, amino, C₁₋₈alkyl-amino, (C₁₋₈alkyl)₂-amino or C₁₋₈alkyl-thio; wherein, halogen and halo is selected from fluoro, chloro, bromo or iodo.

In one embodiment of a compound of Formula (I), R₅ is hydroxy.

In one embodiment of a compound of Formula (I), R₅ is C₁₋₈alkyl selected from methyl, ethyl, propyl, isopropyl, n-butyl or tert-butyl.

In another embodiment of a compound of Formula (I), R₅ is C₁₋₈alkyl selected from ethyl, propyl, isopropyl or tert-butyl.

In one embodiment of a compound of Formula (I), R₅ is halo-C₁₋₈alkyl selected from trihalo-methyl, dihalo-methyl, halo-methyl, trihalo-ethyl, dihalo-ethyl, halo-ethyl, trihalo-propyl, dihalo-propyl or halo-propyl; wherein, halo is selected from fluoro, chloro, bromo or iodo.

In one embodiment of a compound of Formula (I), R₅ is C₁₋₈alkoxy selected from methoxy, ethoxy, propoxy or isopropoxy.

In one embodiment of a compound of Formula (I), R₅ is halo-C₁₋₈alkoxy selected from trihalo-methoxy, dihalo-methoxy, halo-methoxy, trihalo-ethoxy, dihalo-ethoxy, halo-ethoxy, trihalo-propoxy, dihalo-propoxy or halo-propoxy; wherein, halo is selected from fluoro, chloro, bromo or iodo.

In one embodiment of a compound of Formula (I), R₂ is aryl selected from phenyl optionally substituted with R₆ and R₇ substituents.

In one embodiment of a compound of Formula (I), R₂ is aryl-amino, wherein aryl is selected from phenyl; and, wherein, each instance of aryl is optionally substituted with R₆ and R₇ substituents.

In another embodiment of a compound of Formula (I), R₂ is aryl-amino selected from phenyl-amino; wherein, each instance of aryl is optionally substituted with R₆ and R₇ substituents.

In one embodiment of a compound of Formula (I), R₂ is aryl-amino-carbonyl, wherein aryl is selected from phenyl; and, wherein, each instance of aryl is optionally substituted with R₆ and R₇ substituents.

In another embodiment of a compound of Formula (I), R₂ is aryl-amino-carbonyl selected from phenyl-amino-carbonyl; wherein, each instance of aryl is optionally substituted with R₆ and R₇ substituents.

In one embodiment of a compound of Formula (I),

-   -   R₂ is heterocyclyl selected from 1,2,3,6-tetrahydropyridinyl,         1,3-benzodioxolyl or 2,3-dihydro-1,4-benzodioxinyl; wherein,         each instance of heterocyclyl is optionally substituted with R₆         and R₇ substituents.

In another embodiment of a compound of Formula (I),

-   -   R₂ is heterocyclyl selected from 1,2,3,6-tetrahydropyridin-4-yl,         1,3-benzodioxol-5-yl or 2,3-dihydro-1,4-benzodioxin-6-yl;         wherein, each instance of heterocyclyl is optionally substituted         with R₆ and R₇ substituents.

In one embodiment of a compound of Formula (I),

-   -   R₂ is heteroaryl selected from thienyl, 1H-pyrazolyl,         1H-imidazolyl, 1,3-thiazolyl, 1,2,4-oxadiazolyl,         1,3,4-oxadiazolyl, pyridinyl, pyrimidinyl, 1H-indolyl,         2H-indolyl, 1H-indazolyl, 2H-indazolyl, indolizinyl,         benzofuranyl, benzothienyl, 1H-benzimidazolyl,         1,3-benzothiazolyl, 1,3-benzoxazolyl, 9H-purinyl,         furo[3,2-b]pyridinyl, furo[3,2-c]pyridinyl,         furo[2,3-c]pyridinyl, thieno[3,2-c]pyridinyl,         thieno[2,3-d]pyrimidinyl, 1H-pyrrolo[2,3-b]pyridinyl,         1H-pyrrolo[2,3-c]pyridinyl, pyrrolo[1,2-a]pyrimidinyl,         pyrrolo[1,2-a]pyrazinyl, pyrrolo[1,2-b]pyridazinyl,         pyrazolo[1,5-a]pyridinyl, pyrazolo[1,5-a]pyrazinyl,         imidazo[1,2-a]pyridinyl, imidazo[1,2-a]pyrimidinyl,         imidazo[1,2-c]pyrimidinyl, imidazo[1,2-b]pyridazinyl,         imidazo[1,2-a]pyrazinyl, imidazo[2,1-b][1,3]thiazolyl,         imidazo[2,1-b][1,3,4]thiadiazolyl, [1,3]oxazolo[4,5-b]pyridinyl         or quinoxalinyl; wherein, each instance of heteroaryl is         optionally substituted with R₆ and R₇ substituents.

In another embodiment of a compound of Formula (I),

-   -   R₂ is heteroaryl selected from thien-2-yl, thien-3-yl,         1H-pyrazol-3-yl, 1H-pyrazol-4-yl, 1H-pyrazol-5-yl,         1H-imidazol-1-yl, 1H-imidazol-4-yl, 1,3-thiazol-2-yl,         1,2,4-oxadiazol-3-yl, 1,3,4-oxadiazol-2-yl, pyridin-2-yl,         pyridin-3-yl, pyridin-4-yl, pyrimidin-4-yl, 1H-indol-3-yl,         1H-indol-4-yl, 1H-indol-5-yl, 1H-indol-6-yl, 1H-indazol-5-yl,         2H-indazol-5-yl, indolizin-2-yl, benzofuran-2-yl,         benzofuran-5-yl, benzothien-2-yl, benzothien-3-yl,         1H-benzimidazol-2-yl, 1H-benzimidazol-6-yl, 1,3-benzoxazol-2-yl,         1,3-benzoxazol-5-yl, 1,3-benzoxazol-6-yl, 1,3-benzothiazol-2-yl,         1,3-benzothiazol-5-yl, 1,3-benzothiazol-6-yl, 9H-purin-8-yl,         furo[3,2-b]pyridin-2-yl, furo[3,2-c]pyridin-2-yl,         furo[2,3-c]pyridin-2-yl, thieno[3,2-c]pyridin-2-yl,         thieno[2,3-d]pyrimidin-6-yl, 1H-pyrrolo[2,3-b]pyridin-5-yl,         1H-pyrrolo[2,3-c]pyridin-4-yl, pyrrolo[1,2-a]pyrimidin-7-yl,         pyrrolo[1,2-a]pyrazin-7-yl, pyrrolo[1,2-b]pyridazin-2-yl,         pyrazolo[1,5-a]pyridin-2-yl, pyrazolo[1,5-a]pyrazin-2-yl,         imidazo[1,2-a]pyridin-2-yl, imidazo[1,2-a]pyridin-6-yl,         imidazo[1,2-a]pyrimidin-2-yl, imidazo[1,2-a]pyrimidin-6-yl,         imidazo[1,2-c]pyrimidin-2-yl, imidazo[1,2-b]pyridazin-2-yl,         imidazo[1,2-a]pyrazin-2-yl, imidazo[2,1-b][1,3]thiazol-6-yl,         imidazo[2,1-b][1,3,4]thiadiazol-6-yl,         [1,3]oxazolo[4,5-b]pyridin-2-yl or quinoxalin-2-yl; wherein,         each instance of heteroaryl is optionally substituted with R₆         and R₇ substituents.

In another embodiment of a compound of Formula (I),

-   -   R₂ is substituted heteroaryl selected from 4-methylthien-2-yl,         1-methyl-1H-pyrazol-3-yl, 4-methyl-1H-pyrazol-3-yl,         1-phenyl-1H-pyrazol-3-yl, 1-phenyl-1H-imidazol-4-yl,         2-methyl-1-(pyridin-2-yl)-1H-imidazol-4-yl,         4-methyl-1,3-thiazol-2-yl, 4-(trifluoromethyl)-1,3-thiazol-2-yl,         4-phenyl-1,3-thiazol-2-yl, 5-phenyl-1,2,4-oxadiazol-3-yl,         3-fluoropyridin-4-yl, 6-fluoropyridin-2-yl,         2-chloropyridin-4-yl, 4-chloropyridin-3-yl,         5-chloropyridin-2-yl, 6-methylpyridin-3-yl,         2-(trifluoromethyl)pyridin-3-yl,         4-(trifluoromethyl)pyridin-2-yl,         6-(trifluoromethyl)pyridin-2-yl, 2-methoxypyridin-4-yl,         4-methoxypyridin-3-yl, 6-methoxypyridin-2-yl,         2-ethoxypyridin-3-yl, 6-ethoxypyridin-2-yl,         6-(propan-2-yloxy)pyridin-2-yl, 6-(dimethylamino)pyridin-3-yl,         6-(methylsulfanyl)pyridin-2-yl, 6-(cyclobutyloxy)pyridin-2-yl,         6-(pyrrolidin-1-yl)pyridin-2-yl, 2-methylpyrimidin-4-yl,         2-(propan-2-yl)pyrimidin-4-yl, 2-cyclopropylpyrimidin-4-yl,         1-methyl-1H-indol-3-yl, 2-methyl-2H-indazol-5-yl,         2-methyl-1-benzofuran-5-yl, 1-methyl-1H-benzimidazol-2-yl,         4-methyl-1H-benzimidazol-2-yl 5-fluoro-1H-benzimidazol-2-yl,         4-fluoro-1,3-benzoxazol-2-yl, 5-fluoro-1,3-benzoxazol-2-yl,         4-chloro-1,3-benzoxazol-2-yl, 4-iodo-1,3-benzoxazol-2-yl,         2-methyl-1,3-benzoxazol-6-yl, 4-methyl-1,3-benzoxazol-2-yl,         4-(trifluoromethyl)-1,3-benzoxazol-2-yl,         7-(trifluoromethyl)-1,3-benzoxazol-2-yl,         2-methyl-1,3-benzothiazol-2-yl, 2-methyl-1,3-benzothiazol-5-yl,         2-methyl-1,3-benzothiazol-6-yl, 4-chloro-1,3-benzothiazol-2-yl,         7-chloro-1,3-benzothiazol-2-yl,         4-(trifluoromethyl)-1,3-benzothiazol-2-yl,         5-methylfuro[3,2-b]pyridin-2-yl,         4,6-dimethylfuro[3,2-c]pyridin-2-yl,         5,7-dimethylfuro[2,3-c]pyridin-2-yl,         4,6-dimethylthieno[3,2-c]pyridin-2-yl,         2,4-dimethylthieno[2,3-d]pyrimidin-6-yl,         1-methylpyrrolo[1,2-a]pyrazin-7-yl,         3-methylpyrrolo[1,2-a]pyrazin-7-yl,         1,3-dimethylpyrrolo[1,2-a]pyrazin-7-yl,         2-methylpyrrolo[1,2-b]pyridazin-2-yl,         4,6-dimethylpyrazolo[1,5-a]pyrazin-2-yl,         5-methylpyrazolo[1,5-a]pyridin-2-yl,         4,6-dimethylpyrazolo[1,5-a]pyrazin-2-yl,         2-chloroimidazo[2,1-b][1,3]thiazol-6-yl,         2-methylimidazo[2,1-b][1,3]thiazol-6-yl,         3-methylimidazo[2,1-b][1,3]thiazol-6-yl,         2-ethylimidazo[2,1-b][1,3]thiazol-6-yl,         2-methylimidazo[2,1-b][1,3,4]thiadiazol-6-yl,         6-cyanoimidazo[1,2-a]pyridin-2-yl (also referred to as         2-imidazo[1,2-a]pyridine-6-carbonitrile),         6-fluoroimidazo[1,2-a]pyridin-2-yl,         8-fluoroimidazo[1,2-a]pyridin-2-yl,         6,8-difluoroimidazo[1,2-a]pyridin-2-yl,         7-(trifluoromethyl)imidazo[1,2-a]pyridin-2-yl,         8-(trifluoromethyl)imidazo[1,2-a]pyridin-2-yl,         6-chloroimidazo[1,2-a]pyridin-2-yl,         7-chloroimidazo[1,2-a]pyridin-2-yl,         8-chloroimidazo[1,2-a]pyridin-2-yl,         8-bromoimidazo[1,2-a]pyridin-2-yl,         2-methylimidazo[1,2-a]pyridin-2-yl,         5-methylimidazo[1,2-a]pyridin-2-yl,         6-methylimidazo[1,2-a]pyridin-2-yl,         7-methylimidazo[1,2-a]pyridin-2-yl,         8-methylimidazo[1,2-a]pyridin-2-yl,         7-ethylimidazo[1,2-a]pyridin-2-yl,         8-ethylimidazo[1,2-a]pyridin-2-yl,         6,8-dimethylimidazo[1,2-a]pyridin-2-yl,         8-ethyl-6-methylimidazo[1,2-a]pyridin-2-yl,         7-methoxyimidazo[1,2-a]pyridin-2-yl,         8-methoxyimidazo[1,2-a]pyridin-2-yl,         6-fluoro-8-methylimidazo[1,2-a]pyridin-2-yl,         8-fluoro-6-methylimidazo[1,2-a]pyridin-2-yl,         8-chloro-6-methylimidazo[1,2-a]pyridin-2-yl,         6-methyl-8-nitroimidazo[1,2-a]pyridin-2-yl,         8-cyclopropylimidazo[1,2-a]pyridin-2-yl,         2-methylimidazo[1,2-a]pyridin-6-yl,         2-ethylimidazo[1,2-a]pyridin-6-yl,         2,3-dimethylimidazo[1,2-a]pyridin-6-yl,         2,8-dimethylimidazo[1,2-a]pyridin-6-yl,         2-(trifluoromethyl)imidazo[1,2-a]pyridin-6-yl,         8-chloro-2-methylimidazo[1,2-a]pyridin-6-yl,         8-fluoro-2-methylimidazo[1,2-a]pyridin-6-yl,         6-fluoroimidazo[1,2-a]pyrimidin-2-yl,         6-chloroimidazo[1,2-a]pyrimidin-2-yl,         6-methylimidazo[1,2-a]pyrimidin-2-yl,         7-methylimidazo[1,2-a]pyrimidin-2-yl,         2-methylimidazo[1,2-a]pyrimidin-6-yl,         6-methylimidazo[1,2-b]pyridazin-2-yl,         2-methyl-3-(1,2,3,6-tetrahydropyridin-4-yl)imidazo[1,2-b]pyridazin-6-yl,         6-methylimidazo[1,2-a]pyrazin-2-yl,         8-methylimidazo[1,2-a]pyrazin-2-yl,         6,8-dimethylimidazo[1,2-a]pyrazin-2-yl,         6-chloro-8-methylimidazo[1,2-a]pyrazin-2-yl,         6-methyl-8-(trifluoromethyl)imidazo[1,2-a]pyrazin-2-yl,         8-(methylsulfanyl)imidazo[1,2-a]pyrazin-2-yl,         2-methylimidazo[2,1-b][1,3]thiazol-6-yl,         3-methylimidazo[2,1-b][1,3]thiazol-6-yl or         2-methylimidazo[2,1-b][1,3,4]thiadiazol-6-yl.

In another embodiment of a compound of Formula (I),

-   -   R₂ is heteroaryl selected from thienyl, 1H-pyrazolyl,         1H-imidazolyl, 1,3-thiazolyl, 1,2,4-oxadiazolyl,         1,3,4-oxadiazolyl, pyridinyl, pyrimidinyl, 1H-indolyl,         2H-indolyl, 1H-indazolyl, 2H-indazolyl, indolizinyl,         benzofuranyl, benzothienyl, 1H-benzimidazolyl,         1,3-benzothiazolyl, 1,3-benzoxazolyl, 9H-purinyl; wherein, each         instance of heteroaryl is optionally substituted with R₆ and R₇         substituents.

In another embodiment of a compound of Formula (I),

-   -   R₂ is heteroaryl selected from furo[3,2-b]pyridinyl,         furo[3,2-c]pyridinyl, furo[2,3-c]pyridinyl,         thieno[3,2-c]pyridinyl, thieno[2,3-d]pyrimidinyl,         1H-pyrrolo[2,3-b]pyridinyl, 1H-pyrrolo[2,3-c]pyridinyl,         pyrrolo[1,2-a]pyrimidinyl, pyrrolo[1,2-a]pyrazinyl,         pyrrolo[1,2-b]pyridazinyl, pyrazolo[1,5-a]pyridinyl,         pyrazolo[1,5-a]pyrazinyl, imidazo[1,2-a]pyridinyl,         imidazo[1,2-a]pyrimidinyl, imidazo[1,2-c]pyrimidinyl,         imidazo[1,2-b]pyridazinyl, imidazo[1,2-a]pyrazinyl,         imidazo[2,1-b][1,3]thiazolyl, imidazo[2,1-b][1,3,4]thiadiazolyl,         [1,3]oxazolo[4,5-b]pyridinyl or quinoxalinyl; wherein, each         instance of heteroaryl is optionally substituted with R₆ and R₇         substituents.

In one embodiment of a compound of Formula (I), R₂ is heteroaryl-amino, wherein heteroaryl is selected from pyridinyl or pyrimidinyl; and, wherein, each instance of heteroaryl is optionally substituted with R₆ and R₇ substituents.

In another embodiment of a compound of Formula (I), R₂ is heteroaryl-amino selected from pyridin-2-yl-amino, pyridin-3-yl-amino or pyrimidin-2-yl-amino; wherein, each instance of heteroaryl is optionally substituted with R₆ and R₇ substituents.

In one embodiment of a compound of Formula (I), R₆ is selected from halogen, hydroxy, cyano, nitro, C₁₋₈alkyl, halo-C₁₋₈alkyl, hydroxy-C₁₋₈alkyl, C₁₋₈alkoxy, halo-C₁₋₈alkoxy, C₁₋₈alkoxy-C₁₋₈alkyl, (C₁₋₈alkyl)₂-amino or C₁₋₈alkyl-thio; wherein, halogen and halo is selected from fluoro, chloro, bromo or iodo.

In one embodiment of a compound of Formula (I), R₆ is C₁₋₈alkyl selected from methyl, ethyl, propyl, isopropyl or tert-butyl.

In another embodiment of a compound of Formula (I), R₆ is C₁₋₈alkyl selected from ethyl, propyl, isopropyl or tert-butyl.

In one embodiment of a compound of Formula (I), R₆ is C₂₋₈alkenyl selected from ethenyl, allyl or buta-1,3-dienyl.

In another embodiment of a compound of Formula (I), R₆ is C₂₋₈alkenyl selected from ethenyl or allyl.

In one embodiment of a compound of Formula (I), R₆ is halo-C₁₋₈alkyl selected from trihalo-methyl, dihalo-methyl, halo-methyl, trihalo-ethyl, dihalo-ethyl, halo-ethyl, trihalo-propyl, dihalo-propyl or halo-propyl; wherein, halo is selected from fluoro, chloro, bromo or iodo.

In one embodiment of a compound of Formula (I), R₆ is hydroxy-C₁₋₈alkyl selected from hydroxy-methyl, hydroxy-ethyl, hydroxy-propyl, dihydroxy-propyl, hydroxy-butyl or dihydroxy-butyl.

In another embodiment of a compound of Formula (I), R₆ is hydroxy-C₁₋₈alkyl selected from hydroxy-methyl, dihydroxy-propyl, hydroxy-butyl or dihydroxy-butyl.

In one embodiment of a compound of Formula (I), R₆ is C₁₋₈alkoxy selected from methoxy, ethoxy, propoxy or isopropoxy.

In one embodiment of a compound of Formula (I), R₆ is halo-C₁₋₈alkoxy selected from trihalo-methoxy, dihalo-methoxy, halo-methoxy, trihalo-ethoxy, dihalo-ethoxy, halo-ethoxy, trihalo-propoxy, dihalo-propoxy or halo-propoxy; wherein, halo is selected from fluoro, chloro, bromo or iodo.

In one embodiment of a compound of Formula (I), R₇ is C₃₋₁₄cycloalkyl, C₃₋₁₄cycloalkyl-oxy, aryl, heterocyclyl or heteroaryl; wherein C₃₋₁₄cycloalkyl is selected from cyclopropyl or cyclobutoxy; wherein aryl is selected from phenyl; wherein heterocyclyl is selected from oxetanyl, pyrrolidinyl or 1,2,3,6-tetrahydropyridinyl; and, wherein heteroaryl is selected from thienyl or pyridinyl.

In another embodiment of a compound of Formula (I), R₇ is C₃₋₁₄cycloalkyl or C₃₋₁₄cycloalkyl-oxy, wherein each instance of C₃₋₁₄cycloalkyl is selected from cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl or cycloheptyl.

In another embodiment of a compound of Formula (I), R₇ is C₃₋₈cycloalkyl or C₃₋₈cycloalkyl-oxy, wherein each instance of C₃₋₈cycloalkyl is selected from cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl or cycloheptyl.

In one embodiment of a compound of Formula (I), R₇ is aryl selected from phenyl.

In one embodiment of a compound of Formula (I), R₇ is heterocyclyl selected from oxetanyl, pyrrolidinyl or 1,2,3,6-tetrahydropyridinyl.

In another embodiment of a compound of Formula (I), R₇ is heterocyclyl selected from oxetan-3-yl, pyrrolidin-1-yl or 1,2,3,6-tetrahydropyridin-4-yl.

In one embodiment of a compound of Formula (I), R₇ is heteroaryl selected from thienyl or pyridinyl.

In another embodiment of a compound of Formula (I), R₇ is heteroaryl selected from pyridinyl.

In one embodiment of a compound of Formula (I), R₇ is heteroaryl selected from thien-2-yl or pyridin-2-yl.

In another embodiment of a compound of Formula (I), R₇ is heteroaryl selected from pyridin-2-yl.

In another embodiment of a compound of Formula (I),

-   -   R₁ is heterocyclyl, heterocyclyl-C₁₋₈alkyl,         heterocyclyl-C₁₋₈alkoxy, heterocyclyl-amino,         (heterocyclyl)(C₁₋₈alkyl)amino, heterocyclyl-amino-C₁₋₈alkyl,         heterocyclyl-C₁₋₈alkyl-amino, (heterocyclyl-C₁₋₈alkyl)₂-amino,         (heterocyclyl-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         heterocyclyl-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (heterocyclyl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (heterocyclyl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl,         heterocyclyl-oxy, heterocyclyl-carbonyl,         heterocyclyl-carbonyl-oxy, C₃₋₁₄cycloalkyl,         aryl-C₁₋₈alkyl-amino, (aryl-C₁₋₈alkyl)₂-amino,         (aryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         aryl-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (aryl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (aryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl, heteroaryl,         heteroaryl-C₁₋₈alkyl, heteroaryl-C₁₋₈alkoxy, heteroaryl-amino,         heteroaryl-C₁₋₈alkyl-amino, (heteroaryl-C₁₋₈alkyl)₂-amino,         (heteroaryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         heteroaryl-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (heteroaryl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl or         (heteroaryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl; wherein, each         instance of heterocyclyl, C₃₋₁₄cycloalkyl, aryl and heteroaryl         is optionally substituted with R₃ and R₄ substituents; and,     -   wherein, heterocyclyl is selected from azetidinyl,         tetrahydrofuranyl, pyrrolidinyl, piperidinyl, piperazinyl,         1,4-diazepanyl, 1,2,5,6-tetrahydropyridinyl,         1,2,3,6-tetrahydropyridinyl,         hexahydropyrrolo[3,4-b]pyrrol-(1H)-yl,         (3aS,6aS)-hexahydropyrrolo[3,4-b]pyrrol-(1H)-yl,         (3aR,6aR)-hexahydropyrrolo[3,4-b]pyrrol-(1H)-yl,         hexahydropyrrolo[3,4-b]pyrrol-(2H)-yl,         (3aS,6aS)-hexahydropyrrolo[3,4-b]pyrrol-(2H)-yl,         hexahydropyrrolo[3,4-c]pyrrol-(1H)-yl,         (3aR,6aS)-hexahydropyrrolo[3,4-c]pyrrol-(1H)-yl,         octahydro-5H-pyrrolo[3,2-c]pyridinyl,         octahydro-6H-pyrrolo[3,4-b]pyridinyl,         (4aR,7aR)-octahydro-6H-pyrrolo[3,4-b]pyridinyl,         (4aS,7aS)-octahydro-6H-pyrrolo[3,4-b]pyridinyl,         hexahydropyrrolo[1,2-a]pyrazin-(2H)-one,         hexahydropyrrolo[1,2-a]pyrazin-(1H)-yl,         (7R,8aS)-hexahydropyrrolo[1,2-a]pyrazin-(1H)-yl,         (8aS)-hexahydropyrrolo[1,2-a]pyrazin-(1H)-yl,         (8aR)-hexahydropyrrolo[1,2-a]pyrazin-(1H)-yl,         (8aS)-octahydropyrrolo[1,2-a]pyrazin-(1H)-yl,         (8aR)-octahydropyrrolo[1,2-a]pyrazin-(1H)-yl,         octahydro-2H-pyrido[1,2-a]pyrazinyl, 3-azabicyclo[3.1.0]hexyl,         (1R,5S)-3-azabicyclo[3.1.0]hexyl, 8-azabicyclo[3.2.1]octyl,         (1R,5S)-8-azabicyclo[3.2.1]octyl, 8-azabicyclo[3.2.1]oct-2-enyl,         (1R,5S)-8-azabicyclo[3.2.1]oct-2-enyl, 9-azabicyclo[3.3.1]nonyl,         (1R,5S)-9-azabicyclo[3.3.1]nonyl, 2,5-diazabicyclo[2.2.1]heptyl,         (1S,4S)-2,5-diazabicyclo[2.2.1]heptyl,         2,5-diazabicyclo[2.2.2]octyl, 3,8-diazabicyclo[3.2.1]octyl,         (1R,5S)-3,8-diazabicyclo[3.2.1]octyl,         1,4-diazabicyclo[3.2.2]nonyl, azaspiro[3.3]heptyl,         2,6-diazaspiro[3.3]heptyl, 2,7-diazaspiro[3.5]nonyl,         5,8-diazaspiro[3.5]nonyl, 2,7-diazaspiro[4.4]nonyl or         6,9-diazaspiro[4.5]decyl.

In another embodiment of a compound of Formula (I),

-   -   R₂ is aryl, aryl-amino, aryl-amino-carbonyl, heterocyclyl,         heteroaryl or heteroaryl-amino;     -   wherein, aryl is phenyl;     -   wherein, heterocyclyl is selected from         1,2,3,6-tetrahydropyridinyl, 1,3-benzodioxolyl or         2,3-dihydro-1,4-benzodioxinyl;     -   wherein, heteroaryl is selected from thienyl, 1H-pyrazolyl,         1H-imidazolyl, 1,3-thiazolyl, 1,2,4-oxadiazolyl,         1,3,4-oxadiazolyl, pyridinyl, pyrimidinyl, 1H-indolyl,         2H-indolyl, 1H-indazolyl, 2H-indazolyl, indolizinyl,         benzofuranyl, benzothienyl, 1H-benzimidazolyl,         1,3-benzothiazolyl, 1,3-benzoxazolyl, 9H-purinyl,         furo[3,2-b]pyridinyl, furo[3,2-c]pyridinyl,         furo[2,3-c]pyridinyl, thieno[3,2-c]pyridinyl,         thieno[2,3-d]pyrimidinyl, 1H-pyrrolo[2,3-b]pyridinyl,         1H-pyrrolo[2,3-c]pyridinyl, pyrrolo[1,2-a]pyrimidinyl,         pyrrolo[1,2-a]pyrazinyl, pyrrolo[1,2-b]pyridazinyl,         pyrazolo[1,5-a]pyridinyl, pyrazolo[1,5-a]pyrazinyl,         imidazo[1,2-a]pyridinyl, imidazo[1,2-a]pyrimidinyl,         imidazo[1,2-a]pyrimidinyl, imidazo[1,2-b]pyridazinyl,         imidazo[1,2-a]pyrazinyl, imidazo[2,1-b][1,3]thiazolyl,         imidazo[2,1-b][1,3,4]thiadiazolyl, [1,3]oxazolo[4,5-b]pyridinyl         or quinoxalinyl; and, wherein, each instance of aryl,         heterocyclyl and heteroaryl is optionally substituted with R₆         and R₇ substituents.

In another embodiment of a compound of Formula (I),

-   -   R₁ is heterocyclyl, heterocyclyl-C₁₋₈alkyl,         heterocyclyl-C₁₋₈alkoxy, heterocyclyl-amino,         (heterocyclyl)(C₁₋₈alkyl)amino, heterocyclyl-amino-C₁₋₈alkyl,         heterocyclyl-C₁₋₈alkyl-amino, (heterocyclyl-C₁₋₈alkyl)₂-amino,         (heterocyclyl-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         heterocyclyl-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (heterocyclyl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (heterocyclyl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl,         heterocyclyl-oxy, heterocyclyl-carbonyl,         heterocyclyl-carbonyl-oxy, C₃₋₁₄cycloalkyl,         aryl-C₁₋₈alkyl-amino, (aryl-C₁₋₈alkyl)₂-amino,         (aryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         aryl-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (aryl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (aryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl, heteroaryl,         heteroaryl-C₁₋₈alkyl, heteroaryl-C₁₋₈alkoxy, heteroaryl-amino,         heteroaryl-C₁₋₈alkyl-amino, (heteroaryl-C₁₋₈alkyl)₂-amino,         (heteroaryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         heteroaryl-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (heteroaryl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl or         (heteroaryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl;     -   wherein, heterocyclyl is selected from azetidinyl,         tetrahydrofuranyl, pyrrolidinyl, piperidinyl, piperazinyl,         1,4-diazepanyl, 1,2,5,6-tetrahydropyridinyl,         1,2,3,6-tetrahydropyridinyl,         hexahydropyrrolo[3,4-b]pyrrol-(1H)-yl,         (3aS,6aS)-hexahydropyrrolo[3,4-b]pyrrol-(1H)-yl,         (3aR,6aR)-hexahydropyrrolo[3,4-b]pyrrol-(1H)-yl,         hexahydropyrrolo[3,4-b]pyrrol-(2H)-yl,         (3aS,6aS)-hexahydropyrrolo[3,4-b]pyrrol-(2H)-yl,         hexahydropyrrolo[3,4-c]pyrrol-(1H)-yl,         (3aR,6aS)-hexahydropyrrolo[3,4-c]pyrrol-(1H)-yl,         octahydro-5H-pyrrolo[3,2-c]pyridinyl,         octahydro-6H-pyrrolo[3,4-b]pyridinyl,         (4aR,7aR)-octahydro-6H-pyrrolo[3,4-b]pyridinyl,         (4aS,7aS)-octahydro-6H-pyrrolo[3,4-b]pyridinyl,         hexahydropyrrolo[1,2-a]pyrazin-(2H)-one,         hexahydropyrrolo[1,2-a]pyrazin-(1H)-yl,         (7R,8aS)-hexahydropyrrolo[1,2-a]pyrazin-(1H)-yl,         (8aS)-hexahydropyrrolo[1,2-a]pyrazin-(1H)-yl,         (8aR)-hexahydropyrrolo[1,2-a]pyrazin-(1H)-yl,         (8aS)-octahydropyrrolo[1,2-a]pyrazin-(1H)-yl,         (8aR)-octahydropyrrolo[1,2-a]pyrazin-(1H)-yl,         octahydro-2H-pyrido[1,2-a]pyrazinyl, 3-azabicyclo[3.1.0]hexyl,         (1R,5S)-3-azabicyclo[3.1.0]hexyl, 8-azabicyclo[3.2.1]octyl,         (1R,5S)-8-azabicyclo[3.2.1]octyl, 8-azabicyclo[3.2.1]oct-2-enyl,         (1R,5S)-8-azabicyclo[3.2.1]oct-2-enyl, 9-azabicyclo[3.3.1]nonyl,         (1R,5S)-9-azabicyclo[3.3.1]nonyl, 2,5-diazabicyclo[2.2.1]heptyl,         (1S,4S)-2,5-diazabicyclo[2.2.1]heptyl,         2,5-diazabicyclo[2.2.2]octyl, 3,8-diazabicyclo[3.2.1]octyl,         (1R,5S)-3,8-diazabicyclo[3.2.1]octyl,         1,4-diazabicyclo[3.2.2]nonyl, azaspiro[3.3]heptyl,         2,6-diazaspiro[3.3]heptyl, 2,7-diazaspiro[3.5]nonyl,         5,8-diazaspiro[3.5]nonyl, 2,7-diazaspiro[4.4]nonyl or         6,9-diazaspiro[4.5]decyl; and, wherein, each instance of         heterocyclyl, C₃₋₁₄cycloalkyl, aryl and heteroaryl is optionally         substituted with R₃ and R₄ substituents; and     -   R₂ is aryl, aryl-amino, aryl-amino-carbonyl, heterocyclyl,         heteroaryl or heteroaryl-amino;     -   wherein, heterocyclyl is selected from         1,2,3,6-tetrahydropyridin-4-yl, 1,3-benzodioxol-5-yl or         2,3-dihydro-1,4-benzodioxin-6-yl;     -   wherein, heteroaryl is selected from thienyl, 1H-pyrazolyl,         1H-imidazolyl, 1,3-thiazolyl, 1,2,4-oxadiazolyl,         1,3,4-oxadiazolyl, pyridinyl, pyrimidinyl, 1H-indolyl,         2H-indolyl, 1H-indazolyl, 2H-indazolyl, indolizinyl,         benzofuranyl, benzothienyl, 1H-benzimidazolyl,         1,3-benzothiazolyl, 1,3-benzoxazolyl, 9H-purinyl,         furo[3,2-b]pyridinyl, furo[3,2-c]pyridinyl,         furo[2,3-c]pyridinyl, thieno[3,2-c]pyridinyl,         thieno[2,3-d]pyrimidinyl, 1H-pyrrolo[2,3-b]pyridinyl,         1H-pyrrolo[2,3-c]pyridinyl, pyrrolo[1,2-a]pyrimidinyl,         pyrrolo[1,2-a]pyrazinyl, pyrrolo[1,2-b]pyridazinyl,         pyrazolo[1,5-a]pyridinyl, pyrazolo[1,5-a]pyrazinyl,         imidazo[1,2-a]pyridinyl, imidazo[1,2-a]pyrimidinyl,         imidazo[1,2-a]pyrimidinyl, imidazo[1,2-b]pyridazinyl,         imidazo[1,2-a]pyrazinyl, imidazo[2,1-b][1,3]thiazolyl,         imidazo[2,1-b][1,3,4]thiadiazolyl, [1,3]oxazolo[4,5-b]pyridinyl         or quinoxalinyl; and, wherein, each instance of heterocyclyl and         heteroaryl is optionally substituted with R₆ and R₇         substituents.

In another embodiment of a compound of Formula (I),

-   -   R₁ is C₁₋₈alkyl, amino, C₁₋₈alkyl-amino, (C₁₋₈alkyl)₂-amino,         C₁₋₈alkoxy-C₁₋₈alkyl-amino, (C₁₋₈alkoxy-C₁₋₈alkyl)₂-amino,         (C₁₋₈alkoxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino, amino-C₁₋₈alkyl,         C₁₋₈alkyl-amino-C₁₋₈alkyl, (C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         C₁₋₈alkoxy-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (C₁₋₈alkoxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (C₁₋₈alkoxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl,         amino-C₁₋₈alkyl-amino, (amino-C₁₋₈alkyl)₂-amino,         (amino-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         C₁₋₈alkyl-amino-C₁₋₈alkyl-amino,         (C₁₋₈alkyl-amino-C₁₋₈alkyl)₂-amino,         (C₁₋₈alkyl-amino-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         (C₁₋₈alkyl)₂-amino-C₁₋₈alkyl-amino,         [(C₁₋₈alkyl)₂-amino-C₁₋₈alkyl](C₁₋₈alkyl)amino,         amino-C₁₋₈alkoxy, C₁₋₈alkyl-amino-C₁₋₈alkoxy,         (C₁₋₈alkyl)₂-amino-C₁₋₈alkoxy,         C₁₋₈alkoxy-C₁₋₈alkyl-amino-C₁₋₈alkoxy,         (C₁₋₈alkoxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkoxy,         (C₁₋₈alkoxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkoxy,         amino-C₂₋₈alkenyl, C₁₋₈alkyl-amino-C₂₋₈alkenyl,         (C₁₋₈alkyl)₂-amino-C₂₋₈alkenyl, amino-C₂₋₈alkynyl,         C₁₋₈alkyl-amino-C₂₋₈alkynyl, (C₁₋₈alkyl)₂-amino-C₂₋₈alkynyl,         halo-C₁₋₈alkyl-amino, (halo-C₁₋₈alkyl)₂-amino,         (halo-C₁₋₈alkyl)(C₁₋₈alkyl)amino, hydroxy-C₁₋₈alkyl,         hydroxy-C₁₋₈alkoxy-C₁₋₈alkyl, hydroxy-C₁₋₈alkyl-amino,         (hydroxy-C₁₋₈alkyl)₂-amino, (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl,         hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkoxy,         (hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkoxy,         (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkoxy,         hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl-amino,         (hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl)₂-amino,         (hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl-amino,         (hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl-amino,         [(hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl](C₁₋₈alkyl)amino or         [(hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl](C₁₋₈alkyl)amino;         and     -   R₂ is aryl, aryl-amino, aryl-amino-carbonyl, heterocyclyl,         heteroaryl or heteroaryl-amino, wherein, each instance of aryl,         heterocyclyl and heteroaryl is optionally substituted with R₆         and R₇ substituents.

In another embodiment of a compound of Formula (I),

-   -   R₁ is heterocyclyl, heterocyclyl-C₁₋₈alkyl,         heterocyclyl-C₁₋₈alkoxy, heterocyclyl-amino,         (heterocyclyl)(C₁₋₈alkyl)amino, heterocyclyl-amino-C₁₋₈alkyl,         heterocyclyl-C₁₋₈alkyl-amino, (heterocyclyl-C₁₋₈alkyl)₂-amino,         (heterocyclyl-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         heterocyclyl-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (heterocyclyl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (heterocyclyl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl,         heterocyclyl-oxy, heterocyclyl-carbonyl,         heterocyclyl-carbonyl-oxy, C₃₋₁₄cycloalkyl,         aryl-C₁₋₈alkyl-amino, (aryl-C₁₋₈alkyl)₂-amino,         (aryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         aryl-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (aryl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (aryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl, heteroaryl, hetero         aryl-C₁₋₈alkyl, heteroaryl-C₁₋₈alkoxy, heteroaryl-amino,         heteroaryl-C₁₋₈alkyl-amino, (heteroaryl-C₁₋₈alkyl)₂-amino,         (heteroaryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino, hetero         aryl-C₁₋₈alkyl-amino-C₁₋₈alkyl, (hetero         aryl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl or         (heteroaryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl; wherein, each         instance of heterocyclyl, C₃₋₁₄cycloalkyl, aryl and heteroaryl         is optionally substituted with R₃ and R₄ substituents; and     -   R₂ is aryl, aryl-amino, aryl-amino-carbonyl, heterocyclyl,         heteroaryl or heteroaryl-amino, wherein, each instance of aryl,         heterocyclyl and heteroaryl is optionally substituted with R₆         and R₇ substituents.

In another embodiment of a compound of Formula (I),

-   -   R₁ is heterocyclyl, heterocyclyl-C₁₋₈alkyl,         heterocyclyl-C₁₋₈alkoxy, heterocyclyl-amino,         (heterocyclyl)(C₁₋₈alkyl)amino, heterocyclyl-amino-C₁₋₈alkyl,         heterocyclyl-C₁₋₈alkyl-amino, (heterocyclyl-C₁₋₈alkyl)₂-amino,         (heterocyclyl-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         heterocyclyl-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (heterocyclyl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (heterocyclyl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl,         heterocyclyl-oxy, heterocyclyl-carbonyl or         heterocyclyl-carbonyl-oxy; wherein, each instance of         heterocyclyl is optionally substituted with R₃ and R₄         substituents; and     -   R₂ is aryl, aryl-amino, aryl-amino-carbonyl, heterocyclyl,         heteroaryl or heteroaryl-amino, wherein, each instance of aryl,         heterocyclyl and heteroaryl is optionally substituted with R₆         and R₇ substituents.

In another embodiment of a compound of Formula (I),

-   -   R₁ is heterocyclyl optionally substituted with R₃ and R₄         substituents; and     -   R₂ is aryl, aryl-amino, aryl-amino-carbonyl, heterocyclyl,         heteroaryl or heteroaryl-amino, wherein, each instance of aryl,         heterocyclyl and heteroaryl is optionally substituted with R₆         and R₇ substituents.

In another embodiment of a compound of Formula (I),

-   -   R₁ is C₃₋₁₄cycloalkyl optionally substituted with R₃ and R₄         substituents; and     -   R₂ is aryl, aryl-amino, aryl-amino-carbonyl, heterocyclyl,         heteroaryl or heteroaryl-amino, wherein, each instance of aryl,         heterocyclyl and heteroaryl is optionally substituted with R₆         and R₇ substituents.

In another embodiment of a compound of Formula (I),

-   -   R₁ is aryl-C₁₋₈alkyl-amino, (aryl-C₁₋₈alkyl)₂-amino,         (aryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         aryl-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (aryl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl or         (aryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl; wherein, each         instance of aryl is optionally substituted with R₃ and R₄         substituents; and     -   R₂ is aryl, aryl-amino, aryl-amino-carbonyl, heterocyclyl,         heteroaryl or heteroaryl-amino, wherein, each instance of aryl,         heterocyclyl and heteroaryl is optionally substituted with R₆         and R₇ substituents.

In another embodiment of a compound of Formula (I),

-   -   R₁ is aryl-C₁₋₈alkyl-amino optionally substituted with R₃ and R₄         substituents; and     -   R₂ is aryl, aryl-amino, aryl-amino-carbonyl, heterocyclyl,         heteroaryl or heteroaryl-amino, wherein, each instance of aryl,         heterocyclyl and heteroaryl is optionally substituted with R₆         and R₇ substituents.

In another embodiment of a compound of Formula (I),

-   -   R₁ is heteroaryl, heteroaryl-C₁₋₈alkyl, heteroaryl-C₁₋₈alkoxy,         heteroaryl-amino, heteroaryl-C₁₋₈alkyl-amino,         (heteroaryl-C₁₋₈alkyl)₂-amino,         (heteroaryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         heteroaryl-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (heteroaryl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl or         (heteroaryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl; wherein, each         instance of heterocyclyl, C₃₋₁₄cycloalkyl, aryl and heteroaryl         is optionally substituted with R₃ and R₄ substituents; and     -   R₂ is aryl, aryl-amino, aryl-amino-carbonyl, heterocyclyl,         heteroaryl or heteroaryl-amino, wherein, each instance of aryl,         heterocyclyl and heteroaryl is optionally substituted with R₆         and R₇ substituents.

In another embodiment of a compound of Formula (I),

-   -   R₁ is heteroaryl optionally substituted with R₃ and R₄         substituents; and     -   R₂ is aryl, aryl-amino, aryl-amino-carbonyl, heterocyclyl,         heteroaryl or heteroaryl-amino, wherein, each instance of aryl,         heterocyclyl and heteroaryl is optionally substituted with R₆         and R₇ substituents.

An embodiment of the compound of Formula (I), wherein the compound is selected from Formula (II), Formula (III), Formula (IV), Formula (V), Formula (VI), Formula (VII), Formula (VIII), Formula (IX), Formula (X) or Formula (XI):

-   -   or a form thereof.

In an embodiment of the compound of Formula (II), w₂ is C—R₁, w₆ is C—R₂ and w₃, w₄ and w₅ are independently C—R_(a) or N.

In another embodiment of the compound of Formula (II), w₂ is C—R₂, w₆ is C—R₁ and w₃, w₄ and w₅ are independently C—R_(a) or N.

In an embodiment of the compound of Formula (III), w₂ is C—R₁, w₆ is C—R₂, w₄ and w₅ are independently C—R_(a) or N and w₁ is C—R_(b) or N.

In another embodiment of the compound of Formula (III), w₂ is C—R₂, w₆ is C—R₁, w₄ and w₅ are independently C—R_(a) or N and w₁ is C—R_(b) or N.

In an embodiment of the compound of Formula (IV), w₂ is C—R₁, w₆ is C—R₂, w₃ and w₅ are independently C—R_(a) or N and w₁ is C—R_(b) or N.

In another embodiment of the compound of Formula (IV), w₂ is C—R₂, w₆ is C—R₁, w₃ and w₅ are independently C—R_(a) or N and w₁ is C—R_(b) or N.

In an embodiment of the compound of Formula (V), w₂ is C—R₁, w₆ is C—R₂, w₃ and w₄ are independently C—R_(a) or N and w₁ is C—R_(b) or N.

In another embodiment of the compound of Formula (V), w₂ is C—R₂, w₆ is C—R₁, w₃ and w₄ are independently C—R_(a) or N and w₁ is C—R_(b) or N.

In an embodiment of the compound of Formula (VI), w₂ is C—R₁, w₆ is C—R₂ and w₃ and w₄ are C—R_(a) or N.

In another embodiment of the compound of Formula (VI), w₂ is C—R₂, w₆ is C—R₁ and w₃ and w₄ are C—R_(a) or N.

In an embodiment of the compound of Formula (VII), w₂ is C—R₁, w₆ is C—R₂, w₄ is C—R_(a) or N and w₁ is C—R_(b) or N.

In another embodiment of the compound of Formula (VII), w₂ is C—R₂, w₆ is C—R₁, w₄ is C—R_(a) or N and w₁ is C—R_(b) or N.

In an embodiment of the compound of Formula (VIII), w₂ is C—R₁, w₆ is C—R₂, w₃ is C—R_(a) or N and w₁ is C—R_(b) or N.

In another embodiment of the compound of Formula (VIII), w₂ is C—R₂, w₆ is C—R₁, w₃ is C—R_(a) or N and w₁ is C—R_(b) or N.

In an embodiment of the compound of Formula (IX), w₂ is C—R₁, w₆ is C—R₂ and w₄ is C—R_(a) or N.

In another embodiment of the compound of Formula (IX), w₂ is C—R₂, w₆ is C—R₁ and w₄ is C—R_(a) or N.

In an embodiment of the compound of Formula (X), w₂ is C—R₁, w₆ is C—R₂ and w₃ is C—R_(a) or N.

In another embodiment of the compound of Formula (X), w₂ is C—R₂, w₆ is C—R₁ and w₃ is C—R_(a) or N.

In an embodiment of the compound of Formula (XI), w₂ is C—R₁, w₆ is C—R₂ and w₁ is C—R_(b) or N.

In another embodiment of the compound of Formula (XI), w₂ is C—R₂, w₆ is C—R₁ and w₁ is C—R_(b) or N.

Another embodiment of the compound of Formula (I), wherein the compound is selected from Formula (II) or Formula (III):

-   -   or a form thereof.

An embodiment of the compound of Formula (I) is a compound of Formula (II):

-   -   or a form thereof.

An embodiment of the compound of Formula (I) is a compound of Formula (III):

-   -   or a form thereof.

An embodiment of the compound of Formula (I) is a compound of Formula (IV):

-   -   or a form thereof.

An embodiment of the compound of Formula (I) is a compound of Formula (V):

-   -   or a form thereof.

An embodiment of the compound of Formula (I) is a compound of Formula (VI):

-   -   or a form thereof.

An embodiment of the compound of Formula (I) is a compound of Formula (VII):

-   -   or a form thereof.

An embodiment of the compound of Formula (I) is a compound of Formula (VIII):

-   -   or a form thereof.

An embodiment of the compound of Formula (I) is a compound of Formula (IX):

-   -   or a form thereof.

An embodiment of the compound of Formula (I) is a compound of Formula (X):

-   -   or a form thereof.

An embodiment of the compound of Formula (I) is a compound of Formula (XI):

-   -   or a form thereof.

An embodiment of the compound of Formula (II), Formula (III), Formula (IV), Formula (V), Formula (VI), Formula (VII), Formula (VIII), Formula (IX), Formula (X) or Formula (XI) is a compound selected from Formula (IIa), Formula (IIIa), Formula (IVa), Formula (Va), Formula (VIa), Formula (VIIa), Formula (VIIIa), Formula (IXa), Formula (Xa) or Formula (XIa), respectively:

-   -   or a form thereof.

In an embodiment of the compound of Formula (IIa), one of w₂ and w₆ is C—R₁ and the other is C—R₂, provided that, when w₂ is C—R₁, then w₆ is C—R₂; or, when w₂ is C—R₂, then w₆ is C—R₁.

In an embodiment of the compound of Formula (IIa), one of w₂ and w₆ is C—R₁ and the other is C—R₂, provided that, when w₂ is C—R₁, then w₆ is C—R₂; or, when w₂ is C—R₂, then w₆ is C—R₁.

In an embodiment of the compound of Formula (IVa), one of w₂ and w₆ is C—R₁ and the other is C—R₂, provided that, when w₂ is C—R₁, then w₆ is C—R₂; or, when w₂ is C—R₂, then w₆ is C—R₁.

In an embodiment of the compound of Formula (Va), one of w₂ and w₆ is C—R₁ and the other is C—R₂, provided that, when w₂ is C—R₁, then w₆ is C—R₂; or, when w₂ is C—R₂, then w₆ is C—R₁.

In an embodiment of the compound of Formula (VIa), one of w₂ and w₆ is C—R₁ and the other is C—R₂, provided that, when w₂ is C—R₁, then w₆ is C—R₂; or, when w₂ is C—R₂, then w₆ is C—R₁.

In an embodiment of the compound of Formula (VIIa), one of w₂ and w₆ is C—R₁ and the other is C—R₂, provided that, when w₂ is C—R₁, then w₆ is C—R₂; or, when w₂ is C—R₂, then w₆ is C—R₁.

In an embodiment of the compound of Formula (VIIIa), one of w₂ and w₆ is C—R₁ and the other is C—R₂, provided that, when w₂ is C—R₁, then w₆ is C—R₂; or, when w₂ is C—R₂, then w₆ is C—R₁.

In an embodiment of the compound of Formula (IXa), one of w₂ and w₆ is C—R₁ and the other is C—R₂, provided that, when w₂ is C—R₁, then w₆ is C—R₂; or, when w₂ is C—R₂, then w₆ is C—R₁.

In an embodiment of the compound of Formula (Xa), one of w₂ and w₆ is C—R₁ and the other is C—R₂, provided that, when w₂ is C—R₁, then w₆ is C—R₂; or, when w₂ is C—R₂, then w₆ is C—R₁.

In an embodiment of the compound of Formula (XIa), one of w₂ and w₆ is C—R₁ and the other is C—R₂, provided that, when w₂ is C—R₁, then w₆ is C—R₂; or, when w₂ is C—R₂, then w₆ is C—R₁.

An embodiment of the compound of Formula (II) or Formula (III) is a compound selected from Formula (IIa) or Formula (IIIa), respectively:

-   -   or a form thereof.

An embodiment of the compound of Formula (II) is a compound of Formula (IIa):

-   -   or a form thereof.

An embodiment of the compound of Formula (III) is a compound of Formula (IIa):

-   -   or a form thereof.

An embodiment of the compound of Formula (IV) is a compound of Formula (IVa):

-   -   or a form thereof.

An embodiment of the compound of Formula (V) is a compound of Formula (Va):

-   -   or a form thereof.

An embodiment of the compound of Formula (VI) is a compound of Formula (VIa):

-   -   or a form thereof.

An embodiment of the compound of Formula (VII) is a compound of Formula (VIIa):

-   -   or a form thereof.

An embodiment of the compound of Formula (VIII) is a compound of Formula (VIIIa):

-   -   or a form thereof.

An embodiment of the compound of Formula (IX) is a compound of Formula (IXa):

-   -   or a form thereof.

An embodiment of the compound of Formula (X) is a compound of Formula (Xa):

-   -   or a form thereof.

An embodiment of the compound of Formula (XI) is a compound of Formula (XIa):

-   -   or a form thereof.

An embodiment of the compound of Formula (IIa) is a compound of Formula (IIa1) or Formula (IIa2):

-   -   or a form thereof.

An embodiment of the compound of Formula (IIIa) is a compound of Formula (IIIa1) or Formula (IIIa2):

-   -   or a form thereof.

An embodiment of the compound of Formula (IVa) is a compound of Formula (IVa1) or Formula (IVa2):

-   -   or a form thereof.

An embodiment of the compound of Formula (Va) is a compound of Formula (Va1) or Formula (Va2):

-   -   or a form thereof.

An embodiment of the compound of Formula (VIa) is a compound of Formula (VIa1) or Formula (VIa2):

-   -   or a form thereof.

An embodiment of the compound of Formula (VIIa) is a compound of Formula (VIIa1) or Formula (VIIa2):

-   -   or a form thereof.

An embodiment of the compound of Formula (VIIIa) is a compound of Formula (VIIIa1) or Formula (VIIIa2):

-   -   or a form thereof.

An embodiment of the compound of Formula (IXa) is a compound of Formula (IXa1) or Formula (IXa2):

-   -   or a form thereof.

An embodiment of the compound of Formula (Xa) is a compound of Formula (Xa1) or Formula (Xa2):

-   -   or a form thereof.

An embodiment of the compound of Formula (XIa) is a compound of Formula (XIa1) or Formula (XIa2):

-   -   or a form thereof.

An embodiment of the compound of Formula (IIa) is a compound of Formula (IIa1):

-   -   or a form thereof.

An embodiment of the compound of Formula (IIa) is a compound of Formula (IIa2):

-   -   or a form thereof.

An embodiment of the compound of Formula (IIIa) is a compound of Formula (IIIa1):

-   -   or a form thereof.

An embodiment of the compound of Formula (IIIa) is a compound of Formula (IIIa2):

-   -   or a form thereof.

An embodiment of the compound of Formula (IVa) is a compound of Formula (IVa1):

-   -   or a form thereof.

An embodiment of the compound of Formula (IVa) is a compound of Formula (IVa2):

-   -   or a form thereof.

An embodiment of the compound of Formula (Va) is a compound of Formula (Va1):

-   -   or a form thereof.

An embodiment of the compound of Formula (Va) is a compound of Formula (Va2):

-   -   or a form thereof.

An embodiment of the compound of Formula (VIa) is a compound of Formula (VIa1):

-   -   or a form thereof.

An embodiment of the compound of Formula (VIa) is a compound of Formula (VIa2):

-   -   or a form thereof.

An embodiment of the compound of Formula (VIIa) is a compound of Formula (VIIa1):

-   -   or a form thereof.

An embodiment of the compound of Formula (VIIa) is a compound of Formula (VIIa2):

-   -   or a form thereof.

An embodiment of the compound of Formula (VIIIa) is a compound of Formula (VIIIa1):

-   -   or a form thereof.

An embodiment of the compound of Formula (VIIIa) is a compound of Formula (VIIIa2):

-   -   or a form thereof.

An embodiment of the compound of Formula (IXa) is a compound of Formula (IXa1):

-   -   or a form thereof.

An embodiment of the compound of Formula (IXa) is a compound of Formula (IXa2):

-   -   or a form thereof.

An embodiment of the compound of Formula (Xa) is a compound of Formula (Xa1):

-   -   or a form thereof.

An embodiment of the compound of Formula (Xa) is a compound of Formula (Xa2):

-   -   or a form thereof.

An embodiment of the compound of Formula (XIa) is a compound of Formula (XIa1):

-   -   or a form thereof.

An embodiment of the compound of Formula (XIa) is a compound of Formula (XIa2):

-   -   or a form thereof.

An embodiment of the compound of Formula (I) is a compound selected from the group consisting of:

-   -   or a form thereof.

TERMINOLOGY

The chemical terms used above and throughout the description herein, unless specifically defined otherwise, shall be understood by one of ordinary skill in the art to have the following indicated meanings.

As used herein, the term “C₁₋₈alkyl” generally refers to saturated hydrocarbon radicals having from one to eight carbon atoms in a straight or branched chain configuration, including, but not limited to, methyl, ethyl, n-propyl (also referred to as propyl or propanyl), isopropyl, n-butyl (also referred to as butyl or butanyl), isobutyl, sec-butyl, tert-butyl, n-pentyl (also referred to as pentyl or pentanyl), n-hexyl (also referred to as hexyl or hexanyl), n-heptyl (also referred to as heptyl or heptanyl), n-octyl and the like. In some embodiments, C₁₋₈alkyl includes, but is not limited to, C₁₋₆alkyl, C₁₋₄alkyl and the like. A C₁₋₈alkyl radical is optionally substituted with substituent species as described herein where allowed by available valences.

As used herein, the term “C₂₋₈alkenyl” generally refers to partially unsaturated hydrocarbon radicals having from two to eight carbon atoms in a straight or branched chain configuration and one or more carbon-carbon double bonds therein, including, but not limited to, ethenyl (also referred to as vinyl), allyl, propenyl and the like. In some embodiments, C₂₋₈alkenyl includes, but is not limited to, C₂₋₆alkenyl, C₂₋₄alkenyl and the like. A C₂₋₈alkenyl radical is optionally substituted with substituent species as described herein where allowed by available valences.

As used herein, the term “C₂₋₈alkynyl” generally refers to partially unsaturated hydrocarbon radicals having from two to eight carbon atoms in a straight or branched chain configuration and one or more carbon-carbon triple bonds therein, including, but not limited to, ethynyl, propynyl, butynyl and the like. In some embodiments, C₂₋₈alkynyl includes, but is not limited to, C₂₋₆alkynyl, C₂₋₄alkynyl and the like. A C₂₋₈alkynyl radical is optionally substituted with substituent species as described herein where allowed by available valences.

As used herein, the term “C₁₋₈alkoxy” generally refers to saturated hydrocarbon radicals having from one to eight carbon atoms in a straight or branched chain configuration of the formula: —O—C₁₋₈alkyl, including, but not limited to, methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, sec-butoxy, tert-butoxy, n-pentoxy, n-hexoxy and the like. In some embodiments, C₁₋₈alkoxy includes, but is not limited to, C₁₋₆alkoxy, C₁₋₄alkoxy and the like. A C₁₋₈alkoxy radical is optionally substituted with substituent species as described herein where allowed by available valences.

As used herein, the term “C₃₋₁₄cycloalkyl” generally refers to a saturated or partially unsaturated monocyclic, bicyclic or polycyclic hydrocarbon radical, including, but not limited to, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cyclohexenyl, cycloheptyl, cyclooctyl, 1H-indanyl, indenyl, tetrahydro-naphthalenyl and the like. In some embodiments, C₃₋₁₄cycloalkyl includes, but is not limited to, C₃₋₈cycloalkyl, C₅₋₈cycloalkyl, C₃₋₁₀cycloalkyl and the like. A C₃₋₁₄cycloalkyl radical is optionally substituted with substituent species as described herein where allowed by available valences.

As used herein, the term “aryl” generally refers to a monocyclic, bicyclic or polycyclic aromatic carbon atom ring structure radical, including, but not limited to, phenyl, naphthyl, anthracenyl, fluorenyl, azulenyl, phenanthrenyl and the like. An aryl radical is optionally substituted with substituent species as described herein where allowed by available valences.

As used herein, the term “heteroaryl” generally refers to a monocyclic, bicyclic or polycyclic aromatic carbon atom ring structure radical in which one or more carbon atom ring members have been replaced, where allowed by structural stability, with one or more heteroatoms, such as an O, S or N atom, including, but not limited to, furanyl (also referred to as furyl), thienyl (also referred to as thiophenyl), pyrrolyl, 2H-pyrrolyl, 3H-pyrrolyl, pyrazolyl, 1H-pyrazolyl, imidazolyl, 1H-imidazolyl, isoxazolyl, isothiazolyl, oxazolyl, 1,3-thiazolyl, triazolyl (such as 1H-1,2,3-triazolyl and the like), oxadiazolyl (such as 1,2,4-oxadiazolyl, 1,3,4-oxadiazolyl and the like), thiadiazolyl, tetrazolyl (such as 1H-tetrazolyl, 2H-tetrazolyl and the like), pyridinyl (also referred to as pyridyl), pyrimidinyl, pyrazinyl, pyridazinyl, triazinyl, indolyl, 1H-indolyl, indazolyl, 1H-indazolyl, 2H-indazolyl, indolizinyl, isoindolyl, benzofuranyl, benzothienyl (also referred to as benzothiophenyl), benzoimidazolyl, 1H-benzoimidazolyl, 1,3-benzothiazolyl, 1,3-benzoxazolyl (also referred to as 1,3-benzooxazolyl), purinyl, 9H-purinyl, quinolinyl, isoquinolinyl, quinazolinyl, quinoxalinyl, 1,3-diazinyl, 1,2-diazinyl, 1,2-diazolyl, 1,4-diazanaphthalenyl, acridinyl, furo[3,2-b]pyridinyl, furo[3,2-c]pyridinyl, furo[2,3-c]pyridinyl, 6H-thieno[2,3-b]pyrrolyl, thieno[3,2-c]pyridinyl, thieno[2,3-d]pyrimidinyl, 1H-pyrrolo[2,3-b]pyridinyl, 1H-pyrrolo[2,3-c]pyridinyl, 1H-pyrrolo[3,2-b]pyridinyl, pyrrolo[1,2-a]pyrazinyl, pyrrolo[1,2-b]pyridazinyl, pyrazolo[1,5-a]pyridinyl, pyrazolo[1,5-a]pyrazinyl, imidazo[1,2-a]pyridinyl, 3H-imidazo[4,5-b]pyridinyl, imidazo[1,2-a]pyrimidinyl, imidazo[1,2-c]pyrimidinyl, imidazo[1,2-b]pyridazinyl, imidazo[1,2-a]pyrazinyl, imidazo[2,1-b][1,3]thiazolyl, imidazo[2,1-b][1,3,4]thiadiazolyl, [1,2,4]triazolo[1,5-a]pyridinyl, [1,2,4]triazolo[4,3-a]pyridinyl and the like. A heteroaryl radical is optionally substituted on a carbon or nitrogen atom ring member with substituent species as described herein where allowed by available valences.

As used herein, the term “heterocyclyl” generally refers to a saturated or partially unsaturated monocyclic, bicyclic or polycyclic carbon atom ring structure radical in which one or more carbon atom ring members have been replaced, where allowed by structural stability, with a heteroatom, such as an O, S or N atom, including, but not limited to, oxiranyl, oxetanyl, azetidinyl, tetrahydrofuranyl, pyrrolinyl, pyrrolidinyl, pyrazolinyl, pyrazolidinyl, imidazolinyl, imidazolidinyl, isoxazolinyl, isoxazolidinyl, isothiazolinyl, isothiazolidinyl, oxazolinyl, oxazolidinyl, thiazolinyl, thiazolidinyl, triazolinyl, triazolidinyl, oxadiazolinyl, oxadiazolidinyl, thiadiazolinyl, thiadiazolidinyl, tetrazolinyl, tetrazolidinyl, pyranyl, dihydro-2H-pyranyl, thiopyranyl, 1,3-dioxanyl, 1,2,5,6-tetrahydropyridinyl, 1,2,3,6-tetrahydropyridinyl, piperidinyl, piperazinyl, morpholinyl, thiomorpholinyl, 1,4-diazepanyl, 1,3-benzodioxolyl (also referred to as benzo[d][1,3]dioxolyl), 1,4-benzodioxanyl, 2,3-dihydro-1,4-benzodioxinyl (also referred to as 2,3-dihydrobenzo[b][1,4]dioxinyl), hexahydropyrrolo[3,4-b]pyrrol-(1H)-yl, (3aS,6aS)-hexahydropyrrolo[3,4-b]pyrrol-(1H)-yl, (3aR,6aR)-hexahydropyrrolo[3,4-b]pyrrol-(1H)-yl, hexahydropyrrolo[3,4-b]pyrrol-(2H)-yl, (3aS,6aS)-hexahydropyrrolo[3,4-b]pyrrol-(2H)-yl, (3aR,6aR)-hexahydropyrrolo[3,4-b]pyrrol-(2H)-yl, hexahydropyrrolo[3,4-c]pyrrol-(1H)-yl, (3aR,6aS)-hexahydropyrrolo[3,4-c]pyrrol-(1H)-yl, (3aR,6aR)-hexahydropyrrolo[3,4-c]pyrrol-(1H)-yl, octahydro-5H-pyrrolo[3,2-c]pyridinyl, octahydro-6H-pyrrolo[3,4-b]pyridinyl, (4aR,7aR)-octahydro-6H-pyrrolo[3,4-b]pyridinyl, (4aS,7aS)-octahydro-6H-pyrrolo[3,4-b]pyridinyl, hexahydropyrrolo[1,2-a]pyrazin-(1H)-yl, (7R,8aS)-hexahydropyrrolo[1,2-a]pyrazin-(1H)-yl, (8aS)-hexahydropyrrolo[1,2-a]pyrazin-(1H)-yl, (8aR)-hexahydropyrrolo[1,2-a]pyrazin-(1H)-yl, (8aS)-octahydropyrrolo[1,2-a]pyrazin-(1H)-yl, (8aR)-octahydropyrrolo[1,2-a]pyrazin-(1H)-yl, hexahydropyrrolo[1,2-a]pyrazin-(2H)-one, octahydro-2H-pyrido[1,2-a]pyrazinyl, 3-azabicyclo[3.1.0]hexyl, (1R,5S)-3-azabicyclo[3.1.0]hexyl, 8-azabicyclo[3.2.1]octyl, (1R,5S)-8-azabicyclo[3.2.1]octyl, 8-azabicyclo[3.2.1]oct-2-enyl, (1R,5S)-8-azabicyclo[3.2.1]oct-2-enyl, 9-azabicyclo[3.3.1]nonyl, (1R,5S)-9-azabicyclo[3.3.1]nonyl, 2,5-diazabicyclo[2.2.1]heptyl, (1S,4S)-2,5-diazabicyclo[2.2.1]heptyl, 2,5-diazabicyclo[2.2.2]octyl, 3,8-diazabicyclo[3.2.1]octyl, (1R,5S)-3,8-diazabicyclo[3.2.1]octyl, 1,4-diazabicyclo[3.2.2]nonyl, azaspiro[3.3]heptyl, 2,6-diazaspiro[3.3]heptyl, 2,7-diazaspiro[3.5]nonyl, 5,8-diazaspiro[3.5]nonyl, 2,7-diazaspiro[4.4]nonyl, 6,9-diazaspiro[4.5]decyl and the like. A heterocyclyl radical is optionally substituted on a carbon or nitrogen atom ring member with substituent species as described herein where allowed by available valences.

As used herein, the term “C₁₋₈alkoxy-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-O—C₁₋₈alkyl.

As used herein, the term “C₁₋₈alkoxy-C₁₋₈alkyl-amino” refers to a radical of the formula: —NH—C₁₋₈alkyl-O—C₁₋₈alkyl.

As used herein, the term “(C₁₋₈alkoxy-C₁₋₈alkyl)₂-amino” refers to a radical of the formula: —N(C₁₋₈alkyl-O—C₁₋₈alkyl)₂.

As used herein, the term “C₁₋₈alkoxy-C₁₋₈alkyl-amino-C₁₋₈alkoxy” refers to a radical of the formula: —O—C₁₋₈alkyl-NH—C₁₋₈alkyl-O—C₁₋₈alkyl.

As used herein, the term “(C₁₋₈alkoxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkoxy” refers to a radical of the formula: —O—C₁₋₈alkyl-N(C₁₋₈alkyl-O—C₁₋₈alkyl)₂.

As used herein, the term “(C₁₋₈alkoxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkoxy” refers to a radical of the formula: —O—C₁₋₈alkyl-N(C₁₋₈alkyl)(C₁₋₈alkyl-O—C₁₋₈alkyl).

As used herein, the term “C₁₋₈alkoxy-C₁₋₈alkyl-amino-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-NH—C₁₋₈alkyl-O—C₁₋₈alkyl.

As used herein, the term “(C₁₋₈alkoxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-N(C₁₋₈alkyl-O—C₁₋₈alkyl)₂.

As used herein, the term “(C₁₋₈alkoxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-N(C₁₋₈alkyl)(C₁₋₈alkyl-O—C₁₋₈alkyl).

As used herein, the term “C₁₋₈alkoxy-carbonyl” refers to a radical of the formula: —C(O)—O—C₁₋₈alkyl.

As used herein, the term “C₁₋₈alkoxy-carbonyl-C₂₋₈alkenyl” refers to a radical of the formula: —C₂₋₈alkenyl-C(O)—O—C₁₋₈alkyl.

As used herein, the term “C₁₋₈alkoxy-carbonyl-amino” refers to a radical of the formula: —NH—C(O)—O—C₁₋₈alkyl.

As used herein, the term “C₁₋₈alkyl-amino” refers to a radical of the formula: —NH—C₁₋₈alkyl.

As used herein, the term “(C₁₋₈alkyl)₂-amino” refers to a radical of the formula: —N(C₁₋₈alkyl)₂.

As used herein, the term “C₁₋₈alkyl-amino-C₂₋₈alkenyl” refers to a radical of the formula: —C₂₋₈alkenyl-NH—C₁₋₈alkyl.

As used herein, the term “(C₁₋₈alkyl)₂-amino-C₂₋₈alkenyl” refers to a radical of the formula: —C₂₋₈alkenyl-N(C₁₋₈alkyl)₂.

As used herein, the term “C₁₋₈alkyl-amino-C₁₋₈alkoxy” refers to a radical of the formula: —O—C₁₋₈alkyl-NH—C₁₋₈alkyl.

As used herein, the term “(C₁₋₈alkyl)₂-amino-C₁₋₈alkoxy” refers to a radical of the formula: —O—C₁₋₈alkyl-N(C₁₋₈alkyl)₂.

As used herein, the term “C₁₋₈alkyl-amino-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-NH—C₁₋₈alkyl.

As used herein, the term “(C₁₋₈alkyl)₂-amino-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-N(C₁₋₈alkyl)₂.

As used herein, the term “C₁₋₈alkyl-amino-C₁₋₈alkyl-amino” refers to a radical of the formula: —NH—C₁₋₈alkyl-NH—C₁₋₈alkyl.

As used herein, the term “(C₁₋₈alkyl)₂-amino-C₁₋₈alkyl-amino” refers to a radical of the formula: —NH—C₁₋₈alkyl-N(C₁₋₈alkyl)₂.

As used herein, the term “(C₁₋₈alkyl-amino-C₁₋₈alkyl)₂-amino” refers to a radical of the formula: —N(C₁₋₈alkyl-NH—C₁₋₈alkyl)₂.

As used herein, the term “[(C₁₋₈alkyl)₂-amino-C₁₋₈alkyl]-amino” refers to a radical of the formula: —N[C₁₋₈alkyl-N(C₁₋₈alkyl)₂]₂.

As used herein, the term “(C₁₋₈alkyl-amino-C₁₋₈alkyl)(C₁₋₈alkyl)amino” refers to a radical of the formula: —N(C₁₋₈alkyl)(C₁₋₈alkyl-NH—C₁₋₈alkyl).

As used herein, the term “[(C₁₋₈alkyl)₂-amino-C₁₋₈alkyl](C₁₋₈alkyl)amino” refers to a radical of the formula: —N(C₁₋₈alkyl) [C₁₋₈alkyl-N(C₁₋₈alkyl)₂]₂.

As used herein, the term “C₁₋₈alkyl-amino-C₂₋₈alkynyl” refers to a radical of the formula: —C₂₋₈alkynyl-NH—C₁₋₈alkyl.

As used herein, the term “(C₁₋₈alkyl)₂-amino-C₂₋₈alkynyl” refers to a radical of the formula: —C₂₋₈alkynyl-N(C₁₋₈alkyl)₂.

As used herein, the term “C₁₋₈alkyl-carbonyl” refers to a radical of the formula: —C(O)—C₁₋₈alkyl.

As used herein, the term “C₁₋₈alkyl-carbonyl-amino” refers to a radical of the formula: —NH—C(O)—C₁₋₈alkyl.

As used herein, the term “C₁₋₈alkyl-thio” refers to a radical of the formula: —S—C₁₋₈alkyl.

As used herein, the term “amino-C₂₋₈alkenyl” refers to a radical of the formula: —C₂₋₈alkenyl-NH₂.

As used herein, the term “amino-C₁₋₈alkoxy” refers to a radical of the formula: —O—C₁₋₈alkyl-NH₂.

As used herein, the term “amino-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-NH₂.

As used herein, the term “amino-C₁₋₈alkyl-amino” refers to a radical of the formula: —NH—C₁₋₈alkyl-NH₂.

As used herein, the term “(amino-C₁₋₈alkyl)₂-amino” refers to a radical of the formula: —N(C₁₋₈alkyl-NH₂)₂.

As used herein, the term “(amino-C₁₋₈alkyl)(C₁₋₈alkyl)amino” refers to a radical of the formula: —N(C₁₋₈alkyl)(C₁₋₈alkyl-NH₂).

As used herein, the term “amino-C₂₋₈alkynyl” refers to a radical of the formula: —C₂₋₈alkynyl-NH₂.

As used herein, the term “aryl-C₁₋₈alkoxy-carbonyl” refers to a radical of the formula: —C(O)—O—C₁₋₈alkyl-aryl.

As used herein, the term “aryl-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-aryl.

As used herein, the term “aryl-C₁₋₈alkyl-amino” refers to a radical of the formula: —NH—C₁₋₈alkyl-aryl.

As used herein, the term “(aryl-C₁₋₈alkyl)₂-amino” refers to a radical of the formula: —N(C₁₋₈alkyl-aryl)₂.

As used herein, the term “(aryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino” refers to a radical of the formula: —N(C₁₋₈alkyl)(C₁₋₈alkyl-aryl).

As used herein, the term “aryl-C₁₋₈alkyl-amino-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-NH—C₁₋₈alkyl-aryl.

As used herein, the term “(aryl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-N(C₁₋₈alkyl-aryl)₂.

As used herein, the term “(aryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-N(C₁₋₈alkyl)(C₁₋₈alkyl-aryl).

As used herein, the term “aryl-amino” refers to a radical of the formula: —NH-aryl.

As used herein, the term “aryl-amino-carbonyl” refers to a radical of the formula: —C(O)—NH-aryl.

As used herein, the term “aryl-sulfonyloxy-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-O—SO₂-aryl.

As used herein, the term “benzoxy-carbonyl” refers to a radical of the formula: —C(O)—O—CH₂-phenyl.

As used herein, the term “C₃₋₁₄cycloalkyl-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-C₃₋₁₄cycloalkyl.

As used herein, the term “C₃₋₁₄cycloalkyl-amino” refers to a radical of the formula: —NH—C₃₋₁₄cycloalkyl.

As used herein, the term “C₃₋₁₄cycloalkyl-oxy” refers to a radical of the formula: —O—C₃₋₁₄cycloalkyl.

As used herein, the term “halo” or “halogen” generally refers to a halogen atom radical, including fluoro, chloro, bromo and iodo.

As used herein, the term “halo-C₁₋₈alkoxy” refers to a radical of the formula: —O—C₁₋₈alkyl-halo, wherein C₁₋₈alkyl is partially or completely substituted with one or more halogen atoms where allowed by available valences.

As used herein, the term “halo-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-halo, wherein C₁₋₈alkyl is partially or completely substituted with one or more halogen atoms where allowed by available valences.

As used herein, the term “halo-C₁₋₈alkyl-amino” refers to a radical of the formula: —NH—C₁₋₈alkyl-halo.

As used herein, the term “(halo-C₁₋₈alkyl)(C₁₋₈alkyl)amino” refers to a radical of the formula: —N(C₁₋₈alkyl)(C₁₋₈alkyl-halo).

As used herein, the term “(halo-C₁₋₈alkyl)₂-amino” refers to a radical of the formula: —N(C₁₋₈alkyl-halo)₂.

As used herein, the term “heteroaryl-C₁₋₈alkoxy” refers to a radical of the formula: —O—C₁₋₈alkyl-heteroaryl.

As used herein, the term “heteroaryl-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-heteroaryl.

As used herein, the term “heteroaryl-C₁₋₈alkyl-amino” refers to a radical of the formula: —NH—C₁₋₈alkyl-hetero aryl.

As used herein, the term “(heteroaryl-C₁₋₈alkyl)₂-amino” refers to a radical of the formula: —N(C₁₋₈alkyl-heteroaryl)₂.

As used herein, the term “(heteroaryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino” refers to a radical of the formula: —N(C₁₋₈alkyl)(C₁₋₈alkyl-hetero aryl).

As used herein, the term “heteroaryl-C₁₋₈alkyl-amino-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-NH—C₁₋₈alkyl-heteroaryl.

As used herein, the term “(heteroaryl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-N(C₁₋₈alkyl-hetero aryl)₂.

As used herein, the term “(heteroaryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-N(C₁₋₈alkyl)(C₁₋₈alkyl-heteroaryl).

As used herein, the term “heteroaryl-amino” refers to a radical of the formula: —NH-heteroaryl.

As used herein, the term “heterocyclyl-C₁₋₈alkoxy” refers to a radical of the formula: —O—C₁₋₈alkyl-heterocyclyl.

As used herein, the term “heterocyclyl-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-heterocyclyl.

As used herein, the term “heterocyclyl-C₁₋₈alkyl-amino” refers to a radical of the formula: —NH—C₁₋₈alkyl-heterocyclyl.

As used herein, the term “(heterocyclyl-C₁₋₈alkyl)₂-amino” refers to a radical of the formula: —N(C₁₋₈alkyl-heterocyclyl)₂.

As used herein, the term “(heterocyclyl-C₁₋₈alkyl)(C₁₋₈alkyl)amino” refers to a radical of the formula: —N(C₁₋₈alkyl)(C₁₋₈alkyl-heterocyclyl).

As used herein, the term “heterocyclyl-C₁₋₈alkyl-amino-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-NH—C₁₋₈alkyl-heterocyclyl.

As used herein, the term “(heterocyclyl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-N(C₁₋₈alkyl-heterocyclyl)₂.

As used herein, the term “(heterocyclyl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-N(C₁₋₈alkyl)(C₁₋₈alkyl-heterocyclyl).

As used herein, the term “heterocyclyl-amino” refers to a radical of the formula: —NH-heterocyclyl.

As used herein, the term “(heterocyclyl)(C₁₋₈alkyl)amino” refers to a radical of the formula: —N(C₁₋₈alkyl)(heterocyclyl).

As used herein, the term “heterocyclyl-amino-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-NH-heterocyclyl.

As used herein, the term “heterocyclyl-carbonyl” refers to a radical of the formula: —C(O)-heterocyclyl.

As used herein, the term “heterocyclyl-carbonyl-oxy” refers to a radical of the formula: —O—C(O)-heterocyclyl.

As used herein, the term “heterocyclyl-oxy” refers to a radical of the formula: —O-heterocyclyl.

As used herein, the term “hydroxy” refers to a radical of the formula: —OH.

As used herein, the term “hydroxy-C₁₋₈alkoxy-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-O—C₁₋₈alkyl-OH.

As used herein, the term “hydroxy-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-OH, wherein C₁₋₈alkyl is partially or completely substituted with one or more hydroxy radicals where allowed by available valences.

As used herein, the term “hydroxy-C₁₋₈alkyl-amino” refers to a radical of the formula: —NH—C₁₋₈alkyl-OH.

As used herein, the term “(hydroxy-C₁₋₈alkyl)₂-amino” refers to a radical of the formula: —N(C₁₋₈alkyl-OH)₂.

As used herein, the term “(hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino” refers to a radical of the formula: —N(C₁₋₈alkyl)(C₁₋₈alkyl-OH).

As used herein, the term “hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-NH—C₁₋₈alkyl-OH.

As used herein, the term “(hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-N(C₁₋₈alkyl-OH)₂.

As used herein, the term “(hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl” refers to a radical of the formula: —C₁₋₈alkyl-N(C₁₋₈alkyl)(C₁₋₈alkyl-OH).

As used herein, the term “hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkoxy” refers to a radical of the formula: —O—C₁₋₈alkyl-NH—C₁₋₈alkyl-OH.

As used herein, the term “(hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkoxy” refers to a radical of the formula: —O—C₁₋₈alkyl-N(C₁₋₈alkyl-OH)₂.

As used herein, the term “(hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkoxy” refers to a radical of the formula: —O—C₁₋₈alkyl-N(C₁₋₈alkyl)(C₁₋₈alkyl-OH).

As used herein, the term “hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl-amino” refers to a radical of the formula: —NH—C₁₋₈alkyl-NH—C₁₋₈alkyl-OH.

As used herein, the term “(hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl)₂-amino” refers to a radical of the formula: —N(C₁₋₈alkyl-NH—C₁₋₈alkyl-OH)₂.

As used herein, the term “(hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl-amino” refers to a radical of the formula: —NH—C₁₋₈alkyl-N(C₁₋₈alkyl-OH)₂.

As used herein, the term “(hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl)(C₁₋₈alkyl)amino” refers to a radical of the formula: —N(C₁₋₈alkyl)(C₁₋₈alkyl-NH—C₁₋₈alkyl-OH).

As used herein, the term “[(hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl](C₁₋₈alkyl)amino” refers to a radical of the formula: —N(C₁₋₈alkyl)[C₁₋₈alkyl-N(C₁₋₈alkyl-OH)₂].

As used herein, the term “(hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl-amino” refers to a radical of the formula: —NH—C₁₋₈alkyl-N(C₁₋₈alkyl, C₁₋₈alkyl-OH).

As used herein, the term “[(hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl](C₁₋₈alkyl)amino” refers to a radical of the formula: —N(C₁₋₈alkyl)[C₁₋₈alkyl-N(C₁₋₈alkyl)(C₁₋₈alkyl-OH)].

As used herein, the term “substituent” means positional variables on the atoms of a core molecule that are attached at a designated atom position, replacing one or more hydrogen atoms on the designated atom, provided that the atom of attachment does not exceed the available valence or shared valences, such that the substitution results in a stable compound. Accordingly, combinations of substituents and/or variables are permissible only if such combinations result in stable compounds. It should also be noted that any carbon as well as heteroatom with a valence level that appears to be unsatisfied as described or shown herein is assumed to have a sufficient number of hydrogen atom(s) to satisfy the valences described or shown.

For the purposes of this description, where one or more substituent variables for a compound of Formula (I) encompass functionalities incorporated into a compound of Formula (I), each functionality appearing at any location within the disclosed compound may be independently selected, and as appropriate, independently and/or optionally substituted.

As used herein, the terms “independently selected,” or “each selected” refer to functional variables in a substituent list that may be attached more than once on the structure of a core molecule, where the pattern of substitution at each occurrence is independent of the pattern at any other occurrence. Further, the use of a generic substituent on a core structure for a compound provided herein is understood to include the replacement of the generic substituent with specie substituents that are included within the particular genus, e.g., aryl may be independently replaced with phenyl or naphthalenyl (also referred to as naphthyl) and the like, such that the resulting compound is intended to be included within the scope of the compounds described herein.

As used herein, the term “each instance of” when used in a phrase such as “ . . . aryl, aryl-C₁₋₈alkyl, heterocyclyl and heterocyclyl-C₁₋₈alkyl, wherein each instance of aryl and heterocyclyl is optionally substituted with one or two substituents.” is intended to include optional, independent substitution on each of the aryl and heterocyclyl rings and on the aryl and heterocyclyl portions of aryl-C₁₋₈alkyl and heterocyclyl-C₁₋₈alkyl.

As used herein, the term “optionally substituted” means that the specified substituent variables, groups, radicals or moieties represent the scope of the genus and may be independently chosen as needed to replace one or more hydrogen atoms on the designated atom of attachment of a core molecule.

As used herein, the terms “stable compound’ or “stable structure” mean a compound that is sufficiently robust to be isolated to a useful degree of purity from a reaction mixture and formulations thereof into an efficacious therapeutic agent.

Compound names provided herein were obtained using ACD Labs Index Name software provided by ACD Labs and/or ChemDraw Ultra software provided by CambridgeSoft®. When the compound name disclosed herein conflicts with the structure depicted, the structure shown will supercede the use of the name to define the compound intended. Nomenclature for substituent radicals defined herein may differ slightly from the chemical name from which they are derived; one skilled in the art will recognize that the definition of the substituent radical is intended to include the radical as found in the chemical name.

The term “SMN,” unless otherwise specified herein, refers to the human SMN1 gene, DNA or RNA, and/or human SMN2 gene, DNA or RNA. In a specific embodiment, the term “SMN1” refers to the human SMN1 gene, DNA or RNA. In another specific embodiment, the term “SMN2” refers to the human SMN2 gene, DNA or RNA.

Nucleic acid sequences for the human SMN1 and SMN2 genes are known in the art. For nucleic acid sequences of human SMN1, see, e.g., GenBank Accession Nos. DQ894095, NM_000344, NM_022874, and BC062723. For nucleic acid sequences of human SMN2, see, e.g., NM_022875, NM_022876, NM_022877, NM_017411, DQ894734 (Life Technologies, Inc. (formerly Invitrogen), Carlsbad, Calif.), BC000908, BC070242, CR595484, CR598529, CR609539, U21914, and BC015308.

The SMN1 gene can be found on the forward strand of human chromosome 5 from approximately nucleotide 70,220,768 to approximately nucleotide 70,249,769. The approximate locations of exons 6, 7 and 8 and introns 6 and 7 of SMN1 on human chromosome 5 are as follows:

-   -   70,241,893 to 70,242,003 exon 6;     -   70,242,004 to 70,247,767 intron 6;     -   70,247,768 to 70,247,821 exon 7;     -   70,247,822 to 70,248,265 intron 7; and,     -   70,248,266 to 70,248,839 exon 8.

The SMN2 gene can be found on the forward strand of human chromosome 5 from approximately nucleotide 69,345,350 to approximately nucleotide 69,374,349.

The approximate locations of exons 6, 7 and 8 and introns 6 and 7 of SMN2 on human chromosome 5 are as follows:

-   -   69,366,468 to 69,366,578 exon 6;     -   69,366,579 to 69,372,347 intron 6;     -   69,372,348 to 69,372,401 exon 7;     -   69,372,402 to 69,372,845 intron 7; and,     -   69,372,846 to 69,373,419 exon 8.

In specific embodiments, the nucleotide sequences delineated above for exons 6, 7 and 8 and introns 6 and 7 of SMN1 are used in the SMN1 minigene nucleic acid constructs described herein. In other specific embodiments, the nucleotide sequences of exons 6, 7 and 8 and introns 6 and 7 of SMN2 in the examples provided herein are used in the SMN2 minigene nucleic acid constructs described herein.

The term “Smn” or “Smn protein,” unless otherwise specified herein, refers to a human Smn protein that contains the amino acid residues encoded by exons 1 through 7 of the SMN1 gene and/or SMN2 gene. In a specific embodiment, the Smn protein is stable and functional in vitro and/or in vivo as assessed by methods known to one of skill in the art. In another specific embodiment, the Smn protein is the full-length protein encoded by the human SMN1 gene and/or SMN2 gene. In another specific embodiment, the Smn protein has the amino acid sequence found at GenBank Accession No. NP_000335, AAC50473.1, AAA66242.1, or NP_059107.

As used herein, the term “enhances the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene,” and analogous terms, unless otherwise specified herein, refers to the inclusion of the complete, intact, non-truncated sequence of exon 7 of SMN2 into the mature mRNA that is transcribed from the SMN2 gene (i.e., resulting in the production of full-length SMN2 mRNA) in vitro and/or in vivo, as assessed by methods known to one of skill in the art, such that increased levels of Smn protein are produced from the SMN2 gene in vitro and/or in vivo, as assessed by methods known to one of skill in the art; or, that increased expression of stable and functional Smn protein is produced from the SMN2 gene in vitro and/or in vivo, as assessed by methods known to one of skill in the art; or, that expression of the fusion protein encoded by the minigene is increased in vitro and/or in vivo, as assessed by methods known to one of skill in the art; or, that expression of Smn protein produced from the SMN2 gene in a subject (e.g., an animal model for SMA or a human subject or an SMA patient) in need thereof is increased.

As used herein, the term “enhances the inclusion of exon 7 of SMN1 into mRNA that is transcribed from the SMN1 gene,” and analogous terms, unless otherwise specified herein, refers to the inclusion of the complete, intact, non-truncated sequence of exon 7 of SMN1 into the mature mRNA that is transcribed from the SMN1 gene (i.e., resulting in the production of full-length SMN1 mRNA) in vitro and/or in vivo, as assessed by methods known to one of skill in the art, such that increased levels of Smn protein are produced from the SMN1 gene in vitro and/or in vivo, as assessed by methods known to one of skill in the art; or, that increased expression of stable and functional Smn protein is produced from the SMN1 gene in vitro and/or in vivo, as assessed by methods known to one of skill in the art; or, that expression of the fusion protein encoded by the minigene is increased in vitro and/or in vivo, as assessed by methods known to one of skill in the art; or, that expression of Smn protein produced from the SMN1 gene in a subject (e.g., an animal model for SMA or a human subject) in need thereof is increased.

As used herein, the term “substantial change” in the context of the amount of mRNA means that the amount of mRNA does not change by a statistically significant amount, e.g., a p value less than a value selected from 0.1, 0.05, 0.01, 0.005, 0.001, 0.0005, 0.0001, 0.00005 or 0.00001.

As used herein, the terms “subject” and “patient” are used interchangeably to refer to an animal or any living organism having sensation and the power of voluntary movement, and which requires for its existence oxygen and organic food. Nonlimiting examples include members of the human, equine, porcine, bovine, rattus, murine, canine and feline species. In some embodiments, the subject is a mammal or a warm-blooded vertebrate animal. In certain embodiments, the subject is a non-human animal. In specific embodiments, the subject is a human. In one specific embodiment, the subject is a human SMA patient.

As used herein, the term “elderly human” refers to a human 65 years old or older.

As used herein, the term “human adult” refers to a human that is 18 years or older.

As used herein, the term “human child” refers to a human that is 1 year to 18 years old.

As used herein, the term “human infant” refers to a newborn to 1 year old year human.

As used herein, the term “human toddler” refers to a human that is 1 year to 3 years old.

Compound Forms

As used herein, the terms “a compound of Formula (II),” “a compound of Formula (IIa),” “a compound of Formula (IIa1),” “a compound of Formula (IIa2),” “a compound of Formula (III),” “a compound of Formula (IIIa),” “a compound of Formula (IIIa1),” “a compound of Formula (IIIa2),” “a compound of Formula (IV),” “a compound of Formula (IVa),” “a compound of Formula (IVa1),” “a compound of Formula (IVa2),” “a compound of Formula (V),” “a compound of Formula (Va),” “a compound of Formula (Va1),” “a compound of Formula (Va2),” “a compound of Formula (VI),” “a compound of Formula (VIa),” “a compound of Formula (VIa1),” “a compound of Formula (VIa2),” “a compound of Formula (VII),” “a compound of Formula (VIIa),” “a compound of Formula (VIIa1),” “a compound of Formula (VIIa2),” “a compound of Formula (VIII),” “a compound of Formula (VIIIa),” “a compound of Formula (VIIIa1),” “a compound of Formula (VIIIa2),” “a compound of Formula (IX),” “a compound of Formula (IXa),” “a compound of Formula (IXa1),” “a compound of Formula (IXa2),” “a compound of Formula (X),” “a compound of Formula (Xa),” “a compound of Formula (Xa1),” “a compound of Formula (Xa2),” “a compound of Formula (XI),” “a compound of Formula (XIa),” “a compound of Formula (XIa1)” and “a compound of Formula (XIa2)” each refer to subgenera of the compound of Formula (I) or a form thereof.

Rather than repeat embodiments for the various subgenera of the compound of Formula (I), in certain embodiments, the term “a compound of Formula (I) or a form thereof” is used to inclusively to refer to a compound of Formula (II) or a form thereof, a compound of Formula (IIa) or a form thereof, a compound of Formula (IIa1) or a form thereof, a compound of Formula (IIa2) or a form thereof, a compound of Formula (III) or a form thereof, a compound of Formula (IIa) or a form thereof, a compound of Formula (IIIa1) or a form thereof, a compound of Formula (IIIa2) or a form thereof, a compound of Formula (IV) or a form thereof, a compound of Formula (IVa) or a form thereof, a compound of Formula (IVa1) or a form thereof, a compound of Formula (IVa2) or a form thereof, a compound of Formula (V) or a form thereof, a compound of Formula (Va) or a form thereof, a compound of Formula (Va1) or a form thereof, a compound of Formula (Va2) or a form thereof, a compound of Formula (VI) or a form thereof, a compound of Formula (VIa) or a form thereof, a compound of Formula (VIa1) or a form thereof, a compound of Formula (VIa2) or a form thereof, a compound of Formula (VII) or a form thereof, a compound of Formula (VIIa) or a form thereof, a compound of Formula (VIIa1) or a form thereof, a compound of Formula (VIIa2) or a form thereof, a compound of Formula (VIII) or a form thereof, a compound of Formula (VIIIa) or a form thereof, a compound of Formula (VIIIa1) or a form thereof, a compound of Formula (VIIIa2) or a form thereof, a compound of Formula (IX) or a form thereof, a compound of Formula (IXa) or a form thereof, a compound of Formula (IXa1) or a form thereof, a compound of Formula (IXa2) or a form thereof, a compound of Formula (X) or a form thereof, a compound of Formula (Xa) or a form thereof, a compound of Formula (Xa1) or a form thereof, a compound of Formula (Xa2) or a form thereof, a compound of Formula (XI) or a form thereof, a compound of Formula (XIa) or a form thereof, a compound of Formula (XIa1) or a form thereof or a compound of Formula (XIa2) or a form thereof, either separately or together.

Thus, embodiments and references to “a compound of Formula (I)” are intended to be inclusive of compounds of Formula (II), Formula (IIa), Formula (IIa1), Formula (IIa2), Formula (III), Formula (IIa), Formula (IIIa1), Formula (IIIa2), Formula (IV), Formula (IVa), Formula (IVa1), Formula (IVa2), Formula (V), Formula (Va), Formula (Va1), Formula (Va2), Formula (VI), Formula (VIa), Formula (VIa1), Formula (VIa2), Formula (VII), Formula (VIIa), Formula (VIIa1), Formula (VIIa2), Formula (VIII), Formula (VIIIa), Formula (VIIIa1), Formula (VIIIa2), Formula (IX), Formula (IXa), Formula (IXa1), Formula (IXa2), Formula (X), Formula (Xa), Formula (Xa1), Formula (Xa2), Formula (XI), Formula (XIa), Formula (XIa1) and Formula (XIa2).

As used herein, the term “form” means a compound of Formula (I) selected from a free acid, free base, salt, isotopologue, stereoisomer, racemate, enantiomer, diastereomer, or tautomer thereof.

In certain embodiments described herein, the form of the compound of Formula (I) is a selected from a salt, isotopologue, stereoisomer, racemate, enantiomer, diastereomer or tautomer thereof.

In certain embodiments described herein, the form of the compound of Formula (I) is a selected from a free acid, isotopologue, stereoisomer, racemate, enantiomer, diastereomer or tautomer thereof.

In certain embodiments described herein, the form of the compound of Formula (I) is a selected from a free base, isotopologue, stereoisomer, racemate, enantiomer, diastereomer or tautomer thereof.

In certain embodiments described herein, the form of the compound of Formula (I) is a free acid, free base or salt thereof.

In certain embodiments described herein, the form of the compound of Formula (I) is an isotopologue thereof.

In certain embodiments described herein, the form of the compound of Formula (I) is a stereoisomer, racemate, enantiomer or diastereomer thereof.

In certain embodiments described herein, the form of the compound of Formula (I) is a tautomer thereof.

In certain embodiments described herein, the form of the compound of Formula (I) is a pharmaceutically acceptable form.

In certain embodiments described herein, the compound of Formula (I) or a form thereof is isolated for use.

As used herein, the term “isolated” means the physical state of a compound of Formula (I) or a form thereof after being isolated and/or purified from a synthetic process (e.g., from a reaction mixture) or natural source or combination thereof according to an isolation or purification process or processes described herein or which are well known to the skilled artisan (e.g., chromatography, recrystallization and the like) in sufficient purity to be characterizable by standard analytical techniques described herein or well known to the skilled artisan.

As used herein, the term “protected” means that a functional group on a compound of Formula (I) is in a form modified to preclude undesired side reactions at the protected site when the compound is subjected to a reaction. Suitable protecting groups will be recognized by those with ordinary skill in the art as well as by reference to standard textbooks such as, for example, T. W. Greene et al, Protective Groups in Organic Synthesis (1991), Wiley, New York.

Prodrugs of a compound of Formula (I) or a form thereof are also contemplated herein.

As used herein, the term “prodrug” means that a functional group on a compound of Formula (I) is in a form (e.g., acting as an active or inactive drug precursor) that is transformed in vivo to yield an active or more active compound of Formula (I) or a form thereof. The transformation may occur by various mechanisms (e.g., by metabolic and/or non-metabolic chemical processes), such as, for example, by hydrolysis and/or metabolism in blood, liver and/or other organs and tissues. A discussion of the use of prodrugs is provided by V. J. Stella, et. al., “Biotechnology: Pharmaceutical Aspects, Prodrugs: Challenges and Rewards,” American Association of Pharmaceutical Scientists and Springer Press, 2007.

In one example, when a compound of Formula (I) or a form thereof contains a carboxylic acid functional group, a prodrug can comprise an ester formed by the replacement of the hydrogen atom of the acid group with a functional group such as alkyl and the like. In another example, when a compound of Formula (I) or a form thereof contains an alcohol functional group, a prodrug can be formed by the replacement of the hydrogen atom of the alcohol group with a functional group such as alkyl or substituted carbonyl and the like. In another example, when a compound of Formula (I) or a form thereof contains an amine functional group, a prodrug can be formed by the replacement of one or more amine hydrogen atoms with a functional group such as alkyl or substituted carbonyl. In another example, when a compound of Formula (I) or a form thereof contains a hydrogen substituent, a prodrug can be formed by the replacement of one or more hydrogen atoms with an alkyl substituent.

Pharmaceutically acceptable prodrugs of compounds of Formula (I) or a form thereof include those compounds substituted with one or more of the following groups: carboxylic acid esters, sulfonate esters, amino acid esters phosphonate esters, mono-, di- or triphosphate esters or alkyl substituents where appropriate. As described herein, it is understood by a person of ordinary skill in the art that one or more of such substituents may be used to provide a compound of Formula (I) or a form thereof for use as a prodrug.

The compounds of Formula (I) can form salts which are intended to be included within the scope of this description. Reference to a compound of Formula (I) herein is understood to include reference to salts thereof, unless otherwise indicated. The term “salt(s)”, as employed herein, denotes acidic salts formed with inorganic and/or organic acids, as well as basic salts formed with inorganic and/or organic bases. In addition, when a compound of Formula (I) contains both a basic moiety, such as, but not limited to a pyridine or imidazole, and an acidic moiety, such as, but not limited to a carboxylic acid, zwitterions (“inner salts”) may be formed and are included within the term “salt(s)” as used herein.

The term “pharmaceutically acceptable salt(s)”, as used herein, means those salts of compounds described herein that are safe and effective (i.e., non-toxic, physiologically acceptable) for use in mammals and that possess biological activity, although other salts are also useful. Salts of the compounds of Formula (I) may be formed, for example, by reacting a compound of Formula (I) with an amount of acid or base, such as an equivalent or stoichiometric amount, in a medium such as one in which the salt precipitates or in an aqueous medium followed by lyophilization.

Pharmaceutically acceptable salts include one or more salts of acidic or basic groups present in compounds described herein. Embodiments of acid addition salts include, but are not limited to, an acetate, diacetate, acid phosphate, ascorbate, benzoate, benzenesulfonate, bisulfate, bitartrate, borate, butyrate, chloride, citrate, camphorate, camphorsulfonate, ethanesulfonate, formate, fumarate, gentisinate, gluconate, glucaronate, glutamate, hydrobromide, hydrochloride, dihydrochloride, trihydrochloride, hydroiodide, isonicotinate, lactate, maleate, methanesulfonate, naphthalenesulfonate, nitrate, oxalate, pamoate, pantothenate, phosphate, propionate, saccharate, salicylate, succinate, sulfate, tartrate, thiocyanate, toluenesulfonate (also known as tosylate), trifluoroacetate, trifluoroacetic acid salt and the like. One or more embodiments of acid addition salts include chloride, hydrobromide, hydrochloride, dihydrochloride, trihydrochloride, acetate, diacetate, trifluoroacetate, trifluoroacetic acid salt and the like. More particular embodiments include a chloride, hydrobromide, hydrochloride, dihydrochloride, trifluoroacetate, trifluoroacetic acid salt and the like.

Additionally, acids which are generally considered suitable for the formation of pharmaceutically useful salts from basic pharmaceutical compounds are discussed, for example, by P. Stahl et al, Camille G. (eds.) Handbook of Pharmaceutical Salts. Properties, Selection and Use. (2002) Zurich: Wiley-VCH; S. Berge et al, Journal of Pharmaceutical Sciences (1977) 66(1) 1-19; P. Gould, International J. of Pharmaceutics (1986) 33, 201-217; Anderson et al, The Practice of Medicinal Chemistry (1996), Academic Press, New York; and in The Orange Book (see, website for Food & Drug Administration, Washington, D.C.). These disclosures are incorporated herein by reference thereto.

Suitable basic salts include, but are not limited to, aluminum, ammonium, calcium, lithium, magnesium, potassium, sodium, zinc, and diethanolamine salts. Certain compounds described herein can also form pharmaceutically acceptable salts with organic bases (for example, organic amines) such as, but not limited to, dicyclohexylamines, tert-butyl amines and the like, and with various amino acids such as, but not limited to, arginine, lysine and the like. Basic nitrogen-containing groups may be quarternized with agents such as lower alkyl halides (e.g., methyl, ethyl, and butyl chlorides, bromides and iodides), dialkyl sulfates (e.g., dimethyl, diethyl, and dibutyl sulfates), long chain halides (e.g., decyl, lauryl, and stearyl chlorides, bromides and iodides), aralkyl halides (e.g., benzyl and phenethyl bromides), and others.

All such acid salts and base salts are intended to be pharmaceutically acceptable salts within the scope of the description herein and all such acid and base salts are considered equivalent to the free forms of the corresponding compounds for the purposes described herein.

Compounds of Formula I and forms thereof may further exist in a tautomeric form. All such tautomeric forms are contemplated herein as part of the present description.

The compounds of Formula (I) may contain asymmetric or chiral centers, and, therefore, may exist in different stereoisomeric forms. The present description is intended to include all stereoisomeric forms of the compounds of Formula (I) as well as mixtures thereof, including racemic mixtures.

The compounds of Formula (I) described herein may include one or more chiral centers, and as such may exist as racemic mixtures (R/S) or as substantially pure enantiomers and diastereomers. The compounds may also exist as substantially pure (R) or (S) enantiomers (when one chiral center is present). In one embodiment, the compounds of Formula (I) described herein are (S) isomers and may exist as enantiomerically pure compositions substantially comprising only the (S) isomer. In another embodiment, the compounds of Formula (I) described herein are (R) isomers and may exist as enantiomerically pure compositions substantially comprising only the (R) isomer. As one of skill in the art will recognize, when more than one chiral center is present, the compounds of Formula (I) described herein may also include portions described as an (R,R), (R,S), (S,R) or (S,S) isomer, as defined by IUPAC Nomenclature Recommendations.

As used herein, the term “substantially pure” refers to compounds consisting substantially of a single isomer in an amount greater than or equal to 90%, in an amount greater than or equal to 92%, in an amount greater than or equal to 95%, in an amount greater than or equal to 98%, in an amount greater than or equal to 99%, or in an amount equal to 100% of the single isomer.

In one aspect, a compound of Formula (I) is a substantially pure (S) enantiomer present in an amount greater than or equal to 90%, in an amount greater than or equal to 92%, in an amount greater than or equal to 95%, in an amount greater than or equal to 98%, in an amount greater than or equal to 99%, or in an amount equal to 100%.

In one aspect, a compound of Formula (I) is a substantially pure (R) enantiomer present in an amount greater than or equal to 90%, in an amount greater than or equal to 92%, in an amount greater than or equal to 95%, in an amount greater than or equal to 98%, in an amount greater than or equal to 99%, or in an amount equal to 100%.

As used herein, a “racemate” is any mixture of isometric forms that are not “enantiomerically pure”, including mixtures such as, without limitation, in a ratio of about 50/50, about 60/40, about 70/30, about 80/20, about 85/15 or about 90/10.

In addition, the present description embraces all geometric and positional isomers. For example, if a compound of Formula (I) incorporates a double bond or a fused ring, both the cis- and trans-forms, as well as mixtures, are embraced within the scope of the description herein.

Diastereomeric mixtures can be separated into their individual diastereomers on the basis of their physical chemical differences by methods well known to those skilled in the art, such as, for example, by chromatography and/or fractional crystallization. Enantiomers can be separated by use of chiral HPLC column or other chromatographic methods known to those skilled in the art.

Enantiomers can also be separated by converting the enantiomeric mixture into a diastereomeric mixture by reaction with an appropriate optically active compound (e.g., chiral auxiliary such as a chiral alcohol or Mosher's acid chloride), separating the diastereomers and converting (e.g., hydrolyzing) the individual diastereomers to the corresponding pure enantiomers. Also, some of the compounds of Formula (I) may be atropisomers (e.g., substituted biaryls) and are considered part of this description.

All stereoisomer forms (for example, geometric isomers, optical isomers, positional isomers and the like) of the present compounds (including salts, solvates, esters and prodrugs and transformed prodrugs thereof) which may exist due to asymmetric carbons on various substituents, including enantiomeric forms (which may exist even in the absence of asymmetric carbons), rotameric forms, atropisomers, diastereomeric forms and regioisomeric forms are contemplated within the scope of the description herein. For example, if a compound of Formula (I) incorporates a double bond or a fused ring, both the cis- and trans-forms, as well as mixtures thereof, are embraced within the scope of the description herein. Also, for example, all keto-enol and imine-enamine tautomeric forms of the compounds are included in the description herein. Individual stereoisomers of the compounds of Formula (I) described herein may, for example, be substantially free of other isomers, or may be present in a racemic mixture, as described supra.

The use of the terms “salt,” “prodrug” and “transformed prodrug” are intended to equally apply to the salts, prodrugs and transformed prodrugs of all contemplated isotopologues, stereoisomers, racemates or tautomers of the instant compounds.

The term “isotopologue” refers to isotopically-enriched compounds which are identical to those recited herein, but for the fact that one or more atoms are replaced by an atom having an atomic mass or mass number different from the atomic mass or mass number usually found in nature. Examples of isotopes that can be incorporated into compounds described herein include isotopes of hydrogen, carbon, nitrogen, oxygen, phosphorus, fluorine and chlorine, such as H², H³, C¹³, C¹⁴, N¹⁵, O¹⁸, O¹⁷, P³¹, P³², S³⁵, F¹⁸, Cl³⁵ and Cl³⁶, respectively, each of which is also within the scope of this description.

Certain isotopically-enriched compounds described herein (e.g., those labeled with H³ and C¹⁴) are useful in compound and/or substrate tissue distribution assays. Tritiated (i.e., H³) and carbon-14 (i.e., C¹⁴) isotopes are particularly preferred for their ease of preparation and detectability. Further, substitution with heavier isotopes such as deuterium (i.e., “deuterium enriched”) may afford certain therapeutic advantages resulting from greater metabolic stability (e.g., increased in vivo half-life or reduced dosage requirements) and hence may be preferred in some circumstances. Isotopically-enriched compounds of Formula (I) can generally be prepared using procedures known to persons of ordinary skill in the art by substituting an appropriate isotopically-enriched reagent for a non-isotopically-enriched reagent.

When the compounds are enriched with deuterium, the deuterium-to-hydrogen ratio on the deuterated atoms of the molecule substantially exceeds the naturally occurring deuterium-to-hydrogen ratio.

An embodiment described herein may include an isotopologue form of the compound of Formula (I), wherein the isotopologue is substituted on one or more atom members of the compound of Formula (I) with one or more deuterium atoms in place of one or more hydrogen atoms.

An embodiment described herein may include a compound of Formula (I) and forms thereof, wherein a carbon atom may have from 1 to 3 hydrogen atoms optionally replaced with deuterium.

One or more compounds described herein may exist in unsolvated as well as solvated forms with pharmaceutically acceptable solvents such as water, ethanol, and the like, and the description herein is intended to embrace both solvated and unsolvated forms.

As used herein, the term “solvate” means a physical association of a compound described herein with one or more solvent molecules. This physical association involves varying degrees of ionic and covalent bonding, including hydrogen bonding. In certain instances the solvate will be capable of isolation, for example when one or more solvent molecules are incorporated in the crystal lattice of the crystalline solid. As used herein, “solvate” encompasses both solution-phase and isolatable solvates. Non-limiting examples of suitable solvates include ethanolates, methanolates, and the like.

One or more compounds described herein may optionally be converted to a solvate. Preparation of solvates is generally known. A typical, non-limiting process involves dissolving a compound in a desired amount of the desired solvent (organic or water or mixtures thereof) at a higher than ambient temperature, and cooling the solution at a rate sufficient to form crystals which are then isolated by standard methods. Analytical techniques such as, for example infrared spectroscopy, show the presence of the solvent (or water) in the crystals as a solvate (or hydrate).

As used herein, the term “hydrate” means a solvate wherein the solvent molecule is water.

Polymorphic crystalline and amorphous forms of the compounds of Formula (I), and of the salts, solvates, esters and prodrugs of the compounds of Formula (I), are further intended to be included in the scope of the compounds described herein.

Compound Uses

Compounds of Formula (I) or a form thereof that enhance inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene are described herein. Such compounds of Formula (I) or a form thereof have been shown to enhance the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene using the assays described herein (see Biological example section, infra). Accordingly, compounds of Formula (I) or a form thereof have utility as enhancers for the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene.

Compounds of Formula (I) or a form thereof for enhancing inclusion of exon 7 of SMN1 into mRNA that is transcribed from the SMN1 gene are described herein. Such compounds of Formula (I) or a form thereof may enhance inclusion of exon 7 of SMN1 into mRNA that is transcribed from the SMN1 gene using, e.g., an SMN1 minigene assay. Accordingly, compounds of Formula (I) or a form thereof may have utility as enhancers for the inclusion of exon 7 of SMN1 into mRNA that is transcribed from the SMN1 gene.

In one aspect, provided herein are methods for modulating the inclusion of exon 7 of SMN2 into RNA transcribed from the SMN2 gene, comprising contacting a human cell with a compound of Formula (I) or a form thereof. In a specific embodiment, provided herein are methods for modulating the inclusion of exon 7 of SMN2 into RNA transcribed from the SMN2 gene, comprising contacting a human cell with a compound of Formula (I) or a form thereof that modulates the expression of an SMN2 minigene described herein or in International Publication No. WO2009/151546 or U.S. Patent Application Publication No. 2011/0086833, each of which is incorporated herein by reference in its entirety. In one embodiment, the minigene is a minigene described in the Examples of International Publication No. WO2009/151546 or U.S. Patent Application Publication No. 2011/0086833. In another embodiment, the minigene is the minigene described in Biological Example 1, infra. The human cell can be contacted with a compound of Formula (I) or a form thereof in vitro and/or in vivo, e.g., in a non-human animal or in a human. In a specific embodiment, the human cell is from or in a human. In another specific embodiment, the human cell is from or in a human SMA patient. In another specific embodiment, the human cell is from or in a human SMA patient, wherein SMA is caused by an inactivating mutation or deletion in the SMN1 gene on both chromosomes, resulting in a loss of SMN1 gene function. In another embodiment, the human cell is a human cell from a human SMA patient. In certain embodiments, the human cell is from a cell line, such as GM03813, GM00232, GM09677, and/or GM23240 (available from Coriell Institute). In one embodiment, the compound is a compound of Formula (I) or a form thereof.

In a specific embodiment, provided herein is a method for enhancing the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene, comprising contacting a human cell with a compound of Formula (I) or a form thereof. In another embodiment, provided herein is a method for enhancing the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene, comprising contacting a human cell with a compound of Formula (I) or a form thereof that enhances the expression of an SMN2 minigene described herein or in International Publication No. WO2009/151546 or U.S. Patent Application Publication No. 2011/0086833, each of which is incorporated herein by reference in its entirety. In one embodiment, the minigene is a minigene described in the Examples of International Publication No. WO2009/151546 or U.S. Patent Application Publication No. 2011/0086833. In another embodiment, the minigene is the minigene described in Biological Example 1, infra. The human cell can be contacted with a compound of Formula (I) or a form thereof in vitro and/or in vivo, e.g., in a non-human animal or in a human. In a specific embodiment, the human cell is from or in a human. In another specific embodiment, the human cell is from or in a human SMA patient. In another specific embodiment, the human cell is from or in a human SMA patient, wherein SMA is caused by an inactivating mutation or deletion in the SMN1 gene on both chromosomes, resulting in a loss of SMN1 gene function. In another embodiment, the human cell is a human cell from a human SMA patient. In certain embodiments, the human cell is from a cell line, such as GM03813, GM00232, GM09677, and/or GM23240 (available from Coriell Institute). In one embodiment, the compound is a compound of Formula (I) or a form thereof.

In another aspect, provided herein are methods for enhancing the inclusion of exon 7 of SMN1 into RNA transcribed from the SMN1 gene, comprising contacting a human cell with a compound of Formula (I) or a form thereof. In a specific embodiment, provided herein are methods for enhancing the inclusion of exon 7 of SMN1 into RNA transcribed from the SMN1 gene, comprising contacting a human cell with a compound of Formula (I) or a form thereof. In another specific embodiment, provided herein are methods for enhancing the inclusion of exon 7 of SMN1 into RNA transcribed from the SMN1 gene, comprising contacting a human cell with a compound of Formula (I) or a form thereof that modulates the expression of an SMN1 minigene described in International Publication No. WO2009/151546 or U.S. Patent Application Publication No. 2011/0086833, each of which is incorporated herein by reference in its entirety. In one embodiment, the minigene is a minigene described in the Examples of International Publication No. WO2009/151546 or U.S. Patent Application Publication No. 2011/0086833. The human cell can be contacted with a compound of Formula (I) or a form thereof in vitro and/or in vivo, e.g., in a non-human animal or in a human. In a specific embodiment, the human cell is from or in a human. In another specific embodiment, the human cell is from or in a human SMA patient. In one embodiment, the compound is a compound of Formula (I) or a form thereof.

In specific embodiments, provided herein are methods for enhancing the inclusion of exon 7 of SMN1 and SMN2 into RNA transcribed from the SMN1 and SMN2 genes, comprising contacting a human cell with a compound of Formula (I) or a form thereof. The human cell can be contacted with a compound of Formula (I) or a form thereof in vitro and/or in vivo, e.g., in a non-human animal or in a human. In a specific embodiment, the human cell is from or in a human. In another specific embodiment, the human cell is from or in a human SMA patient. In one embodiment, the compound is a compound of Formula (I) or a form thereof.

In another aspect, provided herein is a method for modulating the inclusion of exon 7 of SMN2 into RNA transcribed from the SMN2 gene, comprising administering to a non-human animal model for SMA a compound of Formula (I) or a form thereof. In a specific embodiment, provided herein is a method for modulating the inclusion of exon 7 of SMN2 into RNA transcribed from the SMN2 gene, comprising administering to a non-human animal model for SMA a compound of Formula (I) or a form thereof that modulates the expression of an SMN2 minigene described herein or in International Publication No. WO2009/151546 or U.S. Patent Application Publication No. 2011/0086833, each of which is incorporated herein by reference in its entirety. In one embodiment, the minigene is a minigene described in the Examples of International Publication No. WO2009/151546 or U.S. Patent Application Publication No. 2011/0086833. In another embodiment, the minigene is the minigene described in Biological Example 1, infra. In a specific embodiment, the compound is a compound of Formula (I) or a form thereof.

In a specific embodiment, provided herein is a method for enhancing the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene, comprising administering to a non-human animal model for SMA a compound of Formula (I) or a form thereof. In another specific embodiment, provided herein is a method for enhancing the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene, comprising administering to a non-human animal model for SMA a compound of Formula (I) or a form thereof that enhances the expression of an SMN2 minigene described herein or in International Publication No. WO2009/151546 or U.S. Patent Application Publication No. 2011/0086833, each of which is incorporated herein by reference in its entirety. In one embodiment, the minigene is a minigene described in the Examples of International Publication No. WO2009/151546 or U.S. Patent Application Publication No. 2011/0086833. In another embodiment, the minigene is the minigene described in Biological Example 1, infra. In a specific embodiment, the compound is a compound of Formula (I) or a form thereof.

In another aspect, provided herein is a method for enhancing the inclusion of exon 7 of SMN1 into RNA transcribed from the SMN1 gene, comprising administering to a non-human animal model for SMA a compound of Formula (I) or a form thereof. In a specific embodiment, provided herein is a method for enhancing the inclusion of exon 7 of SMN1 into RNA transcribed from the SMN1 gene, comprising administering to a non-human animal model for SMA a compound of Formula (I) or a form thereof that modulates the expression of an SMN1 minigene described herein or in International Publication No. WO2009/151546 or U.S. Patent Application Publication No. 2011/0086833, each of which is incorporated herein by reference in its entirety. In one embodiment, the minigene is a minigene described in the Examples of International Publication No. WO2009/151546 or U.S. Patent Application Publication No. 2011/0086833. In a specific embodiment, the compound is a compound of Formula (I) or a form thereof.

In specific embodiments, provided herein is a method for enhancing the inclusion of exon 7 of SMN1 and SMN2 into RNA transcribed from the SMN1 and SMN2 genes, comprising administering to a non-human animal model for SMA a compound of Formula (I) or a form thereof. In a specific embodiment, the compound is a compound of Formula (I) or a form thereof.

In another aspect, provided herein is a method for increasing the amount of Smn protein, comprising contacting a human cell with a compound of Formula (I) or a form thereof. In a specific embodiment, provided herein is a method for increasing the amount of Smn protein, comprising contacting a human cell with a compound of Formula (I) that enhances the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene. In another specific embodiment, provided herein is a method for increasing the amount of Smn protein, comprising contacting a human cell with a compound of Formula (I) that enhances the inclusion of exon 7 of SMN1 and/or SMN2 into mRNA that is transcribed from the SMN1 and/or SMN2 gene. The human cell can be contacted with a compound of Formula (I) or a form thereof in vitro and/or in vivo, e.g., in a non-human animal or in a human. In a specific embodiment, the human cell is from or in a human. In another specific embodiment, the human cell is from or in a human SMA patient. In another specific embodiment, the human cell is from or in a human SMA patient, wherein SMA is caused by an inactivating mutation or deletion in the SMN1 gene on both chromosomes, resulting in a loss of SMN1 gene function. In another embodiment, the human cell is a human cell from a human SMA patient. In certain embodiments, the human cell is from a cell line, such as GM03813, GM00232, GM09677, and/or GM23240 (available from Coriell Institute). In one embodiment, the compound is a compound of Formula (I) or a form thereof.

In another aspect, provided herein is a method for increasing the amount of Smn protein, comprising administering to a non-human animal model for SMA a compound of Formula (I) or a form thereof. In a specific embodiment, provided herein is a method for increasing the amount of Smn protein, comprising administering to a non-human animal model for SMA a compound of Formula (I) that enhances the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene in, e.g., a cell-based or cell-free assay, such as described in the Biological Examples, infra. In another specific embodiment, provided herein is a method for increasing the amount of Smn protein, comprising administering to a non-human animal model for SMA a compound of Formula (I) that enhances the inclusion of exon 7 of SMN1 and/or SMN2 into mRNA that is transcribed from the SMN1 and/or SMN2 gene in, e.g., a cell-based or cell-free assay.

In one embodiment, the compound of Formula (I) enhances the expression of a minigene described herein or in International Publication No. WO2009/151546 or U.S. Patent Application Publication No. 2011/0086833, each of which is incorporated herein by reference in its entirety. In a specific embodiment, the compound of Formula (I) enhances the expression of a minigene described in the Examples of International Publication No. WO2009/151546 or U.S. Patent Application Publication No. 2011/0086833. In another specific embodiment, the compound of Formula (I) enhances the expression of a minigene described in Biological Example 1, infra. In one embodiment, the compound is a compound of Formula (I) or a form thereof.

In one embodiment, provided herein is the use of a compound of Formula (I) or a form thereof for the preparation of a medicament that enhances the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene. In another embodiment, provided herein is the use of a compound of Formula (I) or a form thereof for the preparation of a medicament that enhances the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene, thereby increasing expression of Smn protein in a human subject in need thereof. In a particular embodiment, the compound of Formula (I) or a form thereof enhances the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene in an assay described herein (see, e.g., the Biological Examples, infra). In a specific embodiment, the compound is a compound of Formula (I) or a form thereof.

In one embodiment, provided herein is the use of a compound of Formula (I) or a form thereof for the preparation of a medicament that enhances the inclusion of exon 7 of SMN1 and/or SMN2 into mRNA that is transcribed from the SMN1 and/or SMN2 gene. In another embodiment, provided herein is the use of a compound of Formula (I) or a form thereof for the preparation of a medicament that enhances the inclusion of exon 7 of SMN1 and/or SMN2 into mRNA that is transcribed from the SMN1 and/or SMN2 gene, thereby increasing expression of Smn protein in a human subject in need thereof. In a specific embodiment, the compound is a compound of Formula (I) or a form thereof.

In another aspect, provided herein are methods for enhancing the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene in a human subject in need thereof, comprising administering to the human subject an effective amount of a compound of Formula (I) or a form thereof. In a specific embodiment, provided herein is a method for enhancing the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene in a human subject in need thereof, comprising administering to the human subject an effective amount a compound of Formula (I) or a form thereof that enhances the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene as determined in an assay described herein (see, e.g., the Biological Examples, infra). In specific embodiments, the effective amount of the compound of Formula (I) or a form thereof is administered to the human subject in a pharmaceutical composition comprising a pharmaceutically acceptable carrier, excipient or diluent. In a particular embodiment, the compound of Formula (I) or a form thereof enhances the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene in an assay described herein (see, e.g., the Biological Examples, infra). In a specific embodiment, the human subject is a human SMA patient. In another specific embodiment, the human subject is a human SMA patient, wherein SMA is caused by an inactivating mutation or deletion in the SMN1 gene on both chromosomes, resulting in a loss of SMN1 gene function. In one embodiment, the compound is a compound of Formula (I) or a form thereof.

In another aspect, provided herein are methods for enhancing the inclusion of exon 7 of SMN1 into mRNA that is transcribed from the SMN1 gene in a human subject in need thereof, comprising administering to the human subject an effective amount of a compound of Formula (I) or a form thereof. In a particular embodiment, the compound of Formula (I) or a form thereof enhances the inclusion of exon 7 of SMN1 into mRNA that is transcribed from the SMN1 gene in an assay described in International Publication No. WO2009/151546 or U.S. Patent Application Publication No. 2011/0086833. In specific embodiments, the effective amount of the compound of Formula (I) or a form thereof is administered to the human subject in a pharmaceutical composition comprising a pharmaceutically acceptable carrier, excipient or diluent. In a specific embodiment, the human subject is a human SMA patient. In one embodiment, the compound is a compound of Formula (I) or a form thereof.

In another aspect, provided herein is a method for enhancing the inclusion of exon 7 of SMN1 and SMN2 into mRNA that is transcribed from the SMN1 and SMN2 genes in a human subject in need thereof, comprising administering to the human subject an effective amount a compound of Formula (I) or a form thereof. In a particular embodiment, the compound of Formula (I) or a form thereof enhances the inclusion of exon 7 of SMN1 into mRNA that is transcribed from the SMN1 gene in an assay(s) described in International Publication No. WO2009/151546 or U.S. Patent Application Publication No. 2011/0086833 (see, e.g., the Examples in those publications), each of which is incorporated herein by reference in its entirety. In specific embodiments, the effective amount of the compound of Formula (I) or a form thereof is administered to the human subject in a pharmaceutical composition comprising a pharmaceutically acceptable carrier, excipient or diluent. In a specific embodiment, the human subject is a human SMA patient. In another specific embodiment, the human subject is a human SMA patient, wherein SMA is caused by an inactivating mutation or deletion in the SMN1 gene on both chromosomes, resulting in a loss of SMN1 gene function. In one embodiment, the compound is a compound of Formula (I) or a form thereof.

In another aspect, provided herein are methods for enhancing the expression of Smn protein in a human subject in need thereof, comprising administering to the human subject an effective amount of a compound of Formula (I) or a form thereof. In a specific embodiment, provided herein is a method for enhancing the expression of Smn protein in a human subject in need thereof, comprising administering to the human subject an effective amount a compound of Formula (I) or a form thereof that enhances the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene. In another specific embodiment, provided herein is a method for enhancing the expression of Smn protein in a human subject in need thereof, comprising administering to the human subject an effective amount a compound of Formula (I) or a form thereof that enhances the inclusion of exon 7 of SMN1 and/or SMN2 into mRNA that is transcribed from the SMN1 and/or SMN2 gene. In specific embodiments, the effective amount of the compound of Formula (I) or a form thereof is administered to the human subject in a pharmaceutical composition comprising a pharmaceutically acceptable carrier, excipient or diluent. In a particular embodiment, the compound of Formula (I) or a form thereof enhances the inclusion of exon 7 of SMN1 and/or SMN2 into mRNA that is transcribed from the SMN1 and/or SMN2 gene in an assay described herein (see, e.g., the Biological Examples, infra) or in International Publication No. WO2009/151546 or U.S. Patent Application Publication No. 2011/0086833 (see, e.g., the Examples in those publications), each of which is incorporated herein by reference in its entirety.

In a specific embodiment, the human subject is a human SMA patient. In another specific embodiment, the human subject is a human SMA patient, wherein SMA is caused by an inactivating mutation or deletion in the teleomeric copy of the SMN1 gene in both chromosomes, resulting in a loss of SMN1 gene function. In one embodiment, the compound is a compound of Formula (I) or a form thereof.

In another embodiment, provided herein is the use of a compound of Formula (I) or a form thereof for the preparation of a medicament that enhances expression of Smn protein in a human subject in need thereof. In a particular embodiment, the compound of Formula (I) or a form thereof enhances the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene as determined in an assay described herein (see, e.g., the Biological Examples, infra). In another embodiment, the compound of Formula (I) or a form thereof enhances the inclusion of exon 7 of SMN1 and/or SMN2 into mRNA that is transcribed from the SMN1 and/or SMN2 gene as determined in an assay described herein (see, e.g., the Biological Examples, infra) or in International Publication No. WO2009/151546 or U.S. Patent Application Publication No. 2011/0086833 (see, e.g., the Examples in those publications), each of which is incorporated herein by reference in its entirety. In a specific embodiment, the compound is a compound of Formula (I) or a form thereof.

In another aspect, provided herein are methods for treating spinal muscular atrophy (SMA), comprising administering to a subject an effective amount of a compound of Formula (I) or a form thereof. In a specific embodiment, provided herein is a method for treating SMA in a human subject in need thereof, comprising administering to the subject an effective amount of a compound of Formula (I) or a form thereof. In another specific embodiment, provided herein is a method for treating SMA in a human subject in need thereof, comprising administering to the subject a pharmaceutical composition comprising an effective amount of a compound of Formula (I) or a form thereof, and a pharmaceutically acceptable carrier, excipient or diluent. In one embodiment, the compound is a compound of Formula (I) or a form thereof.

In another embodiment, provided herein is a method for treating SMA in a human subject in need thereof, comprising administering to the subject an effective amount of a compound of Formula (I) or a form thereof that enhances the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene. In a specific embodiment, provided herein is a method for treating SMA in a human subject in need thereof, comprising administering to the subject a pharmaceutical composition comprising an effective amount of a compound of Formula (I) or a form thereof that enhances the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene, and a pharmaceutically acceptable carrier, excipient or diluent. In another specific embodiment, provided herein is a method for treating SMA in a human subject in need thereof, comprising administering to the subject a pharmaceutical composition comprising an effective amount of a compound of Formula (I) or a form thereof that enhances the inclusion of exon 7 of SMN1 and/or SMN2 into mRNA that is transcribed from the SMN1 and/or SMN2 gene, and a pharmaceutically acceptable carrier, excipient or diluent. In a particular embodiment, the compound of Formula (I) or a form thereof enhances the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene in an assay described herein (see, e.g., the Biological Examples, infra). In another embodiment, the compound of Formula (I) or a form thereof enhances the inclusion of exon 7 of SMN1 and/or SMN2 into mRNA that is transcribed from the SMN1 and/or SMN2 gene as determined in an assay described herein (see, e.g., the Biological Examples, infra) or in International Publication No. WO2009/151546 or U.S. Patent Application Publication No. 2011/0086833 (see, e.g., the Examples in those publications), each of which is incorporated herein by reference in its entirety. In a specific embodiment, the compound is a compound of Formula (I) or a form thereof.

In another embodiment, provided herein is the use of a compound of Formula (I) or a form thereof in the manufacture of a medicament for treating SMA in a human subject in need thereof. In a particular embodiment, the compound of Formula (I) or a form thereof enhances the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene as determined in an assay described herein (see, e.g., the Biological Examples, infra). In another embodiment, the compound of Formula (I) or a form thereof enhances the inclusion of exon 7 of SMN1 and/or SMN2 into mRNA that is transcribed from the SMN1 and/or SMN2 gene as determined in an assay described herein (see, e.g., the Biological Examples, infra) or in International Publication No. WO2009/151546 or U.S. Patent Application Publication No. 2011/0086833 (see, e.g., the Examples in those publications), each of which is incorporated herein by reference in its entirety. In a specific embodiment, the compound is a compound of Formula (I) or a form thereof.

In an embodiment of a use or method provided herein, compounds of Formula (I) or a form thereof are used in combination with one or more additional agents. A compound(s) of Formula (I) or a form thereof can be administered to a subject or contacted with a cell prior to, concurrently with, or subsequent to administering to the subject or contacting the cell with an additional agent(s). A compound(s) of Formula (I) or a form thereof and an additional agent(s) can be administered to a subject or contacted with a cell in single composition or different compositions. In a specific embodiments, a compound(s) of Formula (I) or a form thereof is used in combination with gene replacement of SMN1 (using, e.g., viral delivery vectors). In another specific embodiments, a compound(s) of Formula (I) or a form thereof are used in combination with cell replacement using differentiated SMN1^(+/+) and/or SMN2^(+/+) stem cells. In another specific embodiments, a compound(s) of Formula (I) or a form thereof are used in combination with cell replacement using differentiated SMN1^(+/+) stem cells. In another specific embodiments, a compound(s) of Formula (I) or a form thereof are used in combination with cell replacement using differentiated SMN2^(+/+) stem cells. In another specific embodiment, a compound(s) of Formula (I) or a form thereof are used in combination with aclarubicin. In another specific embodiment, a compound(s) of Formula (I) or a form thereof are used in combination with a transcription activator such as a histone deacetylase (“HDAC”) inhibitor (e.g., butyrates, valproic acid, and hydroxyurea), and mRNA stabilizers (e.g., mRNA decapping inhibitor RG3039 from Repligen).

In one embodiment, provided herein is the use of compounds of Formula (I) or a form thereof in combination with supportive therapy, including respiratory, nutritional or rehabilitation care.

In certain embodiments, treating SMA with a compound of Formula (I) or a form thereof (alone or in combination with an additional agent) has a therapeutic effect and/or beneficial effect. In a specific embodiment, treating SMA with a compound of Formula (I) or a form thereof (alone or in combination with an additional agent) results in one, two or more of the following effects: (i) reduces or ameliorates the severity of SMA; (ii) delays onset of SMA; (iii) inhibits the progression of SMA; (iv) reduces hospitalization of a subject; (v) reduces hospitalization length for a subject; (vi) increases the survival of a subject; (vii) improves the quality of life of a subject; (viii) reduces the number of symptoms associated with SMA; (ix) reduces or ameliorates the severity of a symptom(s) associated with SMA; (x) reduces the duration of a symptom associated with SMA; (xi) prevents the recurrence of a symptom associated with SMA; (xii) inhibits the development or onset of a symptom of SMA; and/or (xiii) inhibits of the progression of a symptom associated with SMA.

Symptoms of SMA include muscle weakness, poor muscle tone, weak cry, weak cough, limpness or a tendency to flop, difficulty sucking or swallowing, difficulty breathing, accumulation of secretions in the lungs or throat, clenched fists with sweaty hand, flickering/vibrating of the tongue, head often tilted to one side, even when lying down, legs that tend to be weaker than the arms, legs frequently assuming a “frog legs” position, feeding difficulties, increased susceptibility to respiratory tract infections, bowel/bladder weakness, lower-than-normal weight, inability to sit without support, failure to walk, failure to crawl, and hypotonia, areflexia, and multiple congenital contractures (arthrogryposis) associated with loss of anterior horn cells.

In a specific embodiment, treating SMA with a compound of Formula (I) or a form thereof (alone or in combination with an additional agent) results in one, two or more of the following effects: (i) a reduction in the loss of muscle strength; (ii) an increase in muscle strength; (iii) a reduction in muscle atrophy; (iv) a reduction in the loss of motor function; (v) an increase in motor neurons; (vii) a reduction in the loss of motor neurons; (viii) protection of SMN deficient motor neurons from degeneration; (ix) an increase in motor function; (x) an increase in pulmonary function; and/or (xi) a reduction in the loss of pulmonary function.

In another embodiment, treating SMA with a compound of Formula (I) or a form thereof (alone or in combination with an additional agent) results in the functional ability or helps retain the functional ability for a human infant or a human toddler to sit up. In another embodiment, treating SMA with a compound of Formula (I) or a form thereof (alone or in combination with an additional agent) results in the functional ability or helps retain the functional ability for a human infant, a human toddler, a human child or a human adult to stand up unaided. In another embodiment, treating SMA with a compound of Formula (I) or a form thereof (alone or in combination with an additional agent) results in the functional ability or helps retain the functional ability for a human infant, a human toddler, a human child or a human adult to walk unaided. In another embodiment, treating SMA with a compound of Formula (I) or a form thereof (alone or in combination with an additional agent) results in the functional ability or helps retain the functional ability for a human infant, a human toddler, a human child or a human adult to run unaided. In another embodiment, treating SMA with a compound of Formula (I) or a form thereof (alone or in combination with an additional agent) results in the functional ability or helps retain the functional ability for a human infant, a human toddler, a human child or a human adult to breathe unaided. In another embodiment, treating SMA with a compound of Formula (I) or a form thereof (alone or in combination with an additional agent) results in the functional ability or helps retain the functional ability for a human infant, a human toddler, a human child or a human adult to turn during sleep unaided. In another embodiment, treating SMA with a compound of Formula (I) or a form thereof (alone or in combination with an additional agent) results in the functional ability or helps retain the functional ability for a human infant, a human toddler, a human child or a human adult to swallow unaided.

In certain embodiments, a primer and/or probe described below in the Biological Examples (e.g., SMN primers such as SEQ ID NO. 1, 7, 8, 11 or 13 and/or SEQ ID NO. 2, 9 or 12, and SMN probes such as a SEQ ID NO. 3 or 10) is used in an assay, such as RT-PCR, RT-qPCR, endpoint RT-PCR, PCR, qPCR, rolling circle amplification, Northern blot or Southern blot, to determine whether a compound of Formula (I) or a form thereof enhances the inclusion of exon 7 of SMN1 and/or SMN2 into mRNA that is transcribed from an SMN1 and/or SMN2 gene. In some embodiments, a primer and/or probe described below in the Biological Examples (e.g., SMN primers such as SEQ ID NO. 1, 7, 8, 11 or 13 and/or SEQ ID NO. 2, 9 or 12, and SMN probes such as a SEQ ID NO. 3 or 10) is used in an assay, such as RT-PCR, RT-qPCR, endpoint RT-PCR, PCR, qPCR, rolling circle amplification, Northern blot or Southern blot, or a pharmaceutical or assay kit as described infra, to monitor patient responses to a compound of Formula (I) or a form thereof.

In one embodiment, a compound of Formula (I):

-   -   or a form thereof is used as described herein, wherein:     -   w₁ is C—R_(b) or N;     -   w₂ and w₆ are independently C—R₁ or C—R₂;     -   w₃, w₄ and w₅ are independently C—R_(a) or N;     -   wherein one of w₂ and w₆ is C—R₁ and the other is C—R₂, provided         that,     -   when w₂ is C—R₁, then w₆ is C—R₂; or, when w₂ is C—R₂, then w₆         is C—R₁; and,     -   wherein one, two or three of w₁, w₃, w₄ and w₅ are independently         N;     -   R₁ is C₁₋₈alkyl, amino, C₁₋₈alkyl-amino, (C₁₋₈alkyl)₂-amino,         C₁₋₈alkoxy-C₁₋₈alkyl-amino, (C₁₋₈alkoxy-C₁₋₈alkyl)₂-amino,         (C₁₋₈alkoxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino, amino-C₁₋₈alkyl,         C₁₋₈alkyl-amino-C₁₋₈alkyl, (C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         C₁₋₈alkoxy-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (C₁₋₈alkoxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (C₁₋₈alkoxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl,         amino-C₁₋₈alkyl-amino, (amino-C₁₋₈alkyl)₂-amino,         (amino-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         C₁₋₈alkyl-amino-C₁₋₈alkyl-amino,         (C₁₋₈alkyl-amino-C₁₋₈alkyl)₂-amino,         (C₁₋₈alkyl-amino-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         (C₁₋₈alkyl)₂-amino-C₁₋₈alkyl-amino,         [(C₁₋₈alkyl)₂-amino-C₁₋₈alkyl](C₁₋₈alkyl)amino,         amino-C₁₋₈alkoxy, C₁₋₈alkyl-amino-C₁₋₈alkoxy,         (C₁₋₈alkyl)₂-amino-C₁₋₈alkoxy,         C₁₋₈alkoxy-C₁₋₈alkyl-amino-C₁₋₈alkoxy,         C₁₋₈alkoxy-C₁₋₈alkyl-amino-C₁₋₈alkoxy,         (C₁₋₈alkoxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkoxy,         amino-C₂₋₈alkenyl, C₁₋₈alkyl-amino-C₂₋₈alkenyl,         (C₁₋₈alkyl)₂-amino-C₂₋₈alkenyl, amino-C₂₋₈alkynyl,         C₁₋₈alkyl-amino-C₂₋₈alkynyl, (C₁₋₈alkyl)₂-amino-C₂₋₈alkynyl,         halo-C₁₋₈alkyl-amino, (halo-C₁₋₈alkyl)₂-amino,         (halo-C₁₋₈alkyl)(C₁₋₈alkyl)amino, hydroxy-C₁₋₈alkyl,         hydroxy-C₁₋₈alkoxy-C₁₋₈alkyl, hydroxy-C₁₋₈alkyl-amino,         (hydroxy-C₁₋₈alkyl)₂-amino, (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl,         hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkoxy,         (hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkoxy,         (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkoxy,         hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl-amino,         (hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl)₂-amino,         (hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl-amino,         (hydroxy-C₁₋₈alkyl-amino-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl-amino,         [(hydroxy-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl](C₁₋₈alkyl)amino,         [(hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl](C₁₋₈alkyl)amino,         heterocyclyl, heterocyclyl-C₁₋₈alkyl, heterocyclyl-C₁₋₈alkoxy,         heterocyclyl-amino, (heterocyclyl)(C₁₋₈alkyl)amino,         heterocyclyl-amino-C₁₋₈alkyl, heterocyclyl-C₁₋₈alkyl-amino,         (heterocyclyl-C₁₋₈alkyl)₂-amino,         (heterocyclyl-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         heterocyclyl-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (heterocyclyl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (heterocyclyl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl,         heterocyclyl-oxy, heterocyclyl-carbonyl,         heterocyclyl-carbonyl-oxy, C₃₋₁₄cycloalkyl,         aryl-C₁₋₈alkyl-amino, (aryl-C₁₋₈alkyl)₂-amino,         (aryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         aryl-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (aryl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         (aryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl, heteroaryl,         heteroaryl-C₁₋₈alkyl, heteroaryl-C₁₋₈alkoxy, heteroaryl-amino,         heteroaryl-C₁₋₈alkyl-amino, (heteroaryl-C₁₋₈alkyl)₂-amino,         (heteroaryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         heteroaryl-C₁₋₈alkyl-amino-C₁₋₈alkyl,         (heteroaryl-C₁₋₈alkyl)₂-amino-C₁₋₈alkyl or         (heteroaryl-C₁₋₈alkyl)(C₁₋₈alkyl)amino-C₁₋₈alkyl;     -   wherein, each instance of heterocyclyl, C₃₋₁₄cycloalkyl, aryl         and heteroaryl is optionally substituted with one, two or three         R₃ substituents and optionally, with one additional R₄         substituent; or,     -   wherein, each instance of heterocyclyl, C₃₋₁₄cycloalkyl, aryl         and heteroaryl is optionally substituted with one, two, three or         four R₃ substituents;     -   R₂ is aryl, aryl-amino, aryl-amino-carbonyl, heterocyclyl,         heteroaryl or heteroaryl-amino;     -   wherein, each instance of aryl, heterocyclyl and heteroaryl is         optionally substituted with one, two or three R₆ substituents         and optionally, with one additional R₇ substituent;     -   R_(a) is, in each instance, independently selected from         hydrogen, halogen or C₁₋₈alkyl;     -   R_(b) is hydrogen, halogen, C₁₋₈alkyl or C₁₋₈alkoxy;     -   R₃ is, in each instance, independently selected from cyano,         halogen, hydroxy, oxo, C₁₋₈alkyl, halo-C₁₋₈alkyl,         C₁₋₈alkyl-carbonyl, C₁₋₈alkoxy, halo-C₁₋₈alkoxy,         C₁₋₈alkoxy-C₁₋₈alkyl, C₁₋₈alkoxy-carbonyl, amino,         C₁₋₈alkyl-amino, (C₁₋₈alkyl)₂-amino, amino-C₁₋₈alkyl,         C₁₋₈alkyl-amino-C₁₋₈alkyl, (C₁₋₈alkyl)₂-amino-C₁₋₈alkyl,         amino-C₁₋₈alkyl-amino, C₁₋₈alkyl-amino-C₁₋₈alkyl-amino,         (C₁₋₈alkyl-amino-C₁₋₈alkyl)₂-amino,         (C₁₋₈alkyl)₂-amino-C₁₋₈alkyl-amino,         [(C₁₋₈alkyl)₂-amino-C₁₋₈alkyl]₂-amino,         (C₁₋₈alkyl-amino-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         [(C₁₋₈alkyl)₂-amino-C₁₋₈alkyl](C₁₋₈alkyl)amino,         C₁₋₈alkoxy-C₁₋₈alkyl-amino, (C₁₋₈alkoxy-C₁₋₈alkyl)₂-amino,         (C₁₋₈alkoxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino,         C₁₋₈alkyl-carbonyl-amino, C₁₋₈alkoxy-carbonyl-amino,         hydroxy-C₁₋₈alkyl, hydroxy-C₁₋₈alkoxy-C₁₋₈alkyl,         hydroxy-C₁₋₈alkyl-amino, (hydroxy-C₁₋₈alkyl)₂-amino or         (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino;     -   R₄ is C₃₋₁₄cycloalkyl, C₃₋₁₄cycloalkyl-C₁₋₈alkyl,         C₃₋₁₄cycloalkyl-amino, aryl-C₁₋₈alkyl, aryl-C₁₋₈alkoxy-carbonyl,         aryl-sulfonyloxy-C₁₋₈alkyl, heterocyclyl or         heterocyclyl-C₁₋₈alkyl; wherein, each instance of         C₃₋₁₄cycloalkyl, aryl and heterocyclyl is optionally substituted         with one, two or three R₅ substituents;     -   R₅ is, in each instance, independently selected from halogen,         hydroxy, cyano, nitro, C₁₋₈alkyl, halo-C₁₋₈alkyl, C₁₋₈alkoxy,         halo-C₁₋₈alkoxy, amino, C₁₋₈alkyl-amino, (C₁₋₈alkyl)₂-amino or         C₁₋₈alkyl-thio;     -   R₆ is, in each instance, independently selected from halogen,         hydroxy, cyano, nitro, C₁₋₈alkyl, C₂₋₈alkenyl, halo-C₁₋₈alkyl,         hydroxy-C₁₋₈alkyl, C₁₋₈alkoxy, halo-C₁₋₈alkoxy,         C₁₋₈alkoxy-C₁₋₈alkyl, amino, C₁₋₈alkyl-amino, (C₁₋₈alkyl)₂-amino         or C₁₋₈alkyl-thio; and,     -   R₇ is C₃₋₁₄cycloalkyl, C₃₋₁₄cycloalkyl-oxy, aryl, heterocyclyl         or heteroaryl.

An embodiment of the use of the compound of Formula (I), wherein the compound is selected from Formula (II), Formula (III), Formula (IV), Formula (V), Formula (VI), Formula (VII), Formula (VIII), Formula (IX), Formula (X) or Formula (XI):

-   -   or a form thereof.

In an embodiment of the use of the compound of Formula (II), w₂ is C—R₁, w₆ is C—R₂ and w₃, w₄ and w₅ are independently C—R_(a) or N.

In another embodiment of the use of the compound of Formula (II), w₂ is C—R₂, w₆ is C—R₁ and w₃, w₄ and w₅ are independently C—R_(a) or N.

In an embodiment of the use of the compound of Formula (III), w₂ is C—R₁, w₆ is C—R₂, w₄ and w₅ are independently C—R_(a) or N and w₁ is C—R_(b) or N.

In another embodiment of the use of the compound of Formula (III), w₂ is C—R₂, w₆ is C—R₁, w₄ and w₅ are independently C—R_(a) or N and w₁ is C—R_(b) or N.

In an embodiment of the use of the compound of Formula (IV), w₂ is C—R₁, w₆ is C—R₂, w₃ and w₅ are independently C—R_(a) or N and w₁ is C—R_(b) or N.

In another embodiment of the use of the compound of Formula (IV), w₂ is C—R₂, w₆ is C—R₁, w₃ and w₅ are independently C—R_(a) or N and w₁ is C—R_(b) or N.

In an embodiment of the use of the compound of Formula (V), w₂ is C—R₁, w₆ is C—R₂, w₃ and w₄ are independently C—R_(a) or N and w₁ is C—R_(b) or N.

In another embodiment of the use of the compound of Formula (V), w₂ is C—R₂, w₆ is C—R₁, w₃ and w₄ are independently C—R_(a) or N and w₁ is C—R_(b) or N.

In an embodiment of the use of the compound of Formula (VI), w₂ is C—R₁, w₆ is C—R₂ and w₃ and w₄ are C—R_(a) or N.

In another embodiment of the use of the compound of Formula (VI), w₂ is C—R₂, w₆ is C—R₁ and w₃ and w₄ are C—R_(a) or N.

In an embodiment of the use of the compound of Formula (VII), w₂ is C—R₁, w₆ is C—R₂, w₄ is C—R_(a) or N and w₁ is C—R_(b) or N.

In another embodiment of the use of the compound of Formula (VII), w₂ is C—R₂, w₆ is C—R₁, w₄ is C—R_(a) or N and w₁ is C—R_(b) or N.

In an embodiment of the use of the compound of Formula (VIII), w₂ is C—R₁, w₆ is C—R₂, w₃ is C—R_(a) or N and w₁ is C—R_(b) or N.

In another embodiment of the use of the compound of Formula (VIII), w₂ is C—R₂, w₆ is C—R₁, w₃ is C—R_(a) or N and w₁ is C—R_(b) or N.

In an embodiment of the use of the compound of Formula (IX), w₂ is C—R₁, w₆ is C—R₂ and w₄ is C—R_(a) or N.

In another embodiment of the use of the compound of Formula (IX), w₂ is C—R₂, w₆ is C—R₁ and w₄ is C—R_(a) or N.

In an embodiment of the use of the compound of Formula (X), w₂ is C—R₁, w₆ is C—R₂ and w₃ is C—R_(a) or N.

In another embodiment of the use of the compound of Formula (X), w₂ is C—R₂, w₆ is C—R₁ and w₃ is C—R_(a) or N.

In an embodiment of the use of the compound of Formula (XI), w₂ is C—R₁, w₆ is C—R₂ and w₁ is C—R_(b) or N.

In another embodiment of the use of the compound of Formula (XI), w₂ is C—R₂, w₆ is C—R₁ and w₁ is C—R_(b) or N.

An embodiment of the use of the compound of Formula (I) is the use of a compound selected from Formula (II) or Formula (III):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (I) is the use of a compound of Formula (II):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (I) is the use of a compound of Formula (III):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (I) is the use of a compound of Formula (IV):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (I) is the use of a compound of Formula (V):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (I) is the use of a compound of Formula (VI):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (I) is the use of a compound of Formula (VII):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (I) is the use of a compound of Formula (VIII):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (I) is the use of a compound of Formula (IX):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (I) is the use of a compound of Formula (X):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (I) is the use of a compound of Formula (XI):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (II), Formula (III), Formula (IV), Formula (V), Formula (VI), Formula (VII), Formula (VIII), Formula (IX), Formula (X) or Formula (XI) is the use of a compound selected from Formula (IIa), Formula (IIa), Formula (IVa), Formula (Va), Formula (VIa), Formula (VIIa), Formula (VIIIa), Formula (IXa), Formula (Xa) pr Formula (XIa), respectively:

-   -   or a form thereof.

In an embodiment of the use of the compound of Formula (IIa), one of w₂ and w₆ is C—R₁ and the other is C—R₂, provided that, when w₂ is C—R₁, then w₆ is C—R₂; or, when w₂ is C—R₂, then w₆ is C—R₁.

In an embodiment of the use of the compound of Formula (IIIa), one of w₂ and w₆ is C—R₁ and the other is C—R₂, provided that, when w₂ is C—R₁, then w₆ is C—R₂; or, when w₂ is C—R₂, then w₆ is C—R₁.

In an embodiment of the use of the compound of Formula (IVa), one of w₂ and w₆ is C—R₁ and the other is C—R₂, provided that, when w₂ is C—R₁, then w₆ is C—R₂; or, when w₂ is C—R₂, then w₆ is C—R₁.

In an embodiment of the use of the compound of Formula (Va), one of w₂ and w₆ is C—R₁ and the other is C—R₂, provided that, when w₂ is C—R₁, then w₆ is C—R₂; or, when w₂ is C—R₂, then w₆ is C—R₁.

In an embodiment of the use of the compound of Formula (VIa), one of w₂ and w₆ is C—R₁ and the other is C—R₂, provided that, when w₂ is C—R₁, then w₆ is C—R₂; or, when w₂ is C—R₂, then w₆ is C—R₁.

In an embodiment of the use of the compound of Formula (VIIa), one of w₂ and w₆ is C—R₁ and the other is C—R₂, provided that, when w₂ is C—R₁, then w₆ is C—R₂; or, when w₂ is C—R₂, then w₆ is C—R₁.

In an embodiment of the use of the compound of Formula (VIIIa), one of w₂ and w₆ is C—R₁ and the other is C—R₂, provided that, when w₂ is C—R₁, then w₆ is C—R₂; or, when w₂ is C—R₂, then w₆ is C—R₁.

In an embodiment of the use of the compound of Formula (IXa), one of w₂ and w₆ is C—R₁ and the other is C—R₂, provided that, when w₂ is C—R₁, then w₆ is C—R₂; or, when w₂ is C—R₂, then w₆ is C—R₁.

In an embodiment of the use of the compound of Formula (Xa), one of w₂ and w₆ is C—R₁ and the other is C—R₂, provided that, when w₂ is C—R₁, then w₆ is C—R₂; or, when w₂ is C—R₂, then w₆ is C—R₁.

In an embodiment of the use of the compound of Formula (XIa), one of w₂ and w₆ is C—R₁ and the other is C—R₂, provided that, when w₂ is C—R₁, then w₆ is C—R₂; or, when w₂ is C—R₂, then w₆ is C—R₁.

An embodiment of the use of the compound of Formula (II) or Formula (III) is the use of a compound selected from Formula (IIa) or Formula (IIIa), respectively:

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (II) is the use of a compound of Formula (IIa):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (III) is the use of a compound of Formula (IIIa):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (IV) is the use of a compound of Formula (IVa):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (V) is the use of a compound of Formula (Va):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (VI) is the use of a compound of Formula (VIa):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (VII) is the use of a compound of Formula (VIIa):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (VIII) is the use of a compound of Formula (VIIIa):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (IX) is the use of a compound of Formula (IXa):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (X) is the use of a compound of Formula (Xa):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (XI) is the use of a compound of Formula (XIa):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (IIa) is the use of a compound of Formula (IIa1) or Formula (IIa2):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (IIIa) is the use of a compound of Formula (IIIa1) or Formula (IIIa2):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (IVa) is the use of a compound of Formula (IVa1) or Formula (IVa2):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (Va) is the use of a compound of Formula (Va1) or Formula (Va2):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (VIa) is the use of a compound of Formula (VIa1) or Formula (VIa2):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (VIIa) is the use of a compound of Formula (VIIa1) or Formula (VIIa2):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (VIIIa) is the use of a compound of Formula (VIIIa1) or Formula (VIIIa2):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (IXa) is the use of a compound of Formula (IXa1) or Formula (IXa2):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (Xa) is the use of a compound of Formula (Xa1) or Formula (Xa2):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (XIa) is the use of a compound of Formula (XIa1) or Formula (XIa2):

-   -   or a form thereof.     -   or a form thereof.

An embodiment of the use of the compound of Formula (IIa) is the use of a compound of Formula (IIa1):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (IIa) is the use of a compound of Formula (IIa2):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (IIIa) is the use of a compound of Formula (IIIa1):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (IIIa) is the use of a compound of Formula (IIIa2):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (IVa) is the use of a compound of Formula (IVa1):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (IVa) is the use of a compound of Formula (IVa2):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (Va) is the use of a compound of Formula (Va1):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (Va) is the use of a compound of Formula (Va2):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (VIa) is the use of a compound of Formula (VIa1):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (VIa) is the use of a compound of Formula (VIa2):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (VIIa) is the use of a compound of Formula (VIIa1):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (VIIa) is the use of a compound of Formula (VIIa2):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (VIIIa) is the use of a compound of Formula (VIIIa1):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (VIIIa) is the use of a compound of Formula (VIIIa2):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (IXa) is the use of a compound of Formula (IXa1):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (IXa) is the use of a compound of Formula (IXa2):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (Xa) is the use of a compound of Formula (Xa1):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (Xa) is the use of a compound of Formula (Xa2):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (XIa) is the use of a compound of Formula (XIa1):

-   -   or a form thereof.

An embodiment of the use of the compound of Formula (XIa) is the use of a compound of Formula (XIa2):

-   -   or a form thereof.         Patient Population

In some embodiments, a compound of Formula (I) or a form thereof, or a pharmaceutical composition thereof is administered to a subject suffering from SMA. In other embodiments, a compound of Formula (I) or a form thereof, is administered to a subject predisposed or susceptible to SMA. In a specific embodiment, a compound of Formula (I) or a form thereof, or a pharmaceutical composition thereof is administered to a human subject having SMA, wherein SMA is caused by an inactivating mutation or deletion in the SMN1 gene on both chromosomes, resulting in a loss of SMN1 gene function. In certain embodiments, the human subject is genotyped prior to administration of a compound of Formula (I) or a form thereof, or a pharmaceutical composition thereof to determine whether the subject has an inactivating mutation or deletion in the teleomeric copy of the SMN1 gene in both chromosomes, which results in a loss of SMN1 gene function. In some embodiments, a compound of Formula (I) or a form thereof, or pharmaceutical composition thereof is administered to a subject with Type 0 SMA. In some embodiments, a compound of Formula (I) or a form thereof, or a pharmaceutical composition thereof is administered to a subject with Type 1 SMA. In other embodiments, a compound of Formula (I) or a form thereof, or a pharmaceutical composition thereof is administered to a subject with Type 2 SMA. In other embodiments, a compound of Formula (I) or a form thereof, or a pharmaceutical composition thereof is administered to a subject with Type 3 SMA. In some embodiments, a compound of Formula (I) or a form thereof, or a pharmaceutical composition thereof is administered to a subject with Type 4 SMA. In certain embodiments, the human subject is an SMA patient.

In certain embodiments, a compound of Formula (I) or a form thereof, or a pharmaceutical composition thereof is administered to a subject that will or might benefit from enhanced inclusion of exon 7 of SMN1 and/or SMN2 into mRNA that is transcribed from the SMN1 and/or SMN2 gene. In specific embodiments, a compound of Formula (I) or a form thereof, or a pharmaceutical composition thereof is administered to a subject that will or may benefit from enhanced Smn protein expression.

In certain embodiments, a compound of Formula (I) or a form thereof, or a pharmaceutical composition thereof is administered to a human that has an age in a range of from about 0 months to about 6 months old, from about 6 to about 12 months old, from about 6 to about 18 months old, from about 18 to about 36 months old, from about 1 to about 5 years old, from about 5 to about 10 years old, from about 10 to about 15 years old, from about 15 to about 20 years old, from about 20 to about 25 years old, from about 25 to about 30 years old, from about 30 to about 35 years old, from about 35 to about 40 years old, from about 40 to about 45 years old, from about 45 to about 50 years old, from about 50 to about 55 years old, from about 55 to about 60 years old, from about 60 to about 65 years old, from about 65 to about 70 years old, from about 70 to about 75 years old, from about 75 to about 80 years old, from about 80 to about 85 years old, from about 85 to about 90 years old, from about 90 to about 95 years old or from about 95 to about 100 years old.

In some embodiments, a compound of Formula (I) or a form thereof, or a pharmaceutical composition thereof is administered to a human infant. In other embodiments, a compound of Formula (I) or a form thereof, or a pharmaceutical composition thereof is administered to a human toddler. In other embodiments, a compound of Formula (I) or a form thereof, or a pharmaceutical composition thereof is administered to a human child. In other embodiments, a compound of Formula (I) or a form thereof, or a pharmaceutical composition thereof is administered to a human adult. In yet other embodiments, a compound of Formula (I) or a form thereof, or a pharmaceutical composition thereof is administered to an elderly human.

In some embodiments, a compound of Formula (I) or a form thereof, or a pharmaceutical composition thereof, is administered to a patient to prevent the onset of SMA in a patient at risk of developing SMA. In other embodiments, an effective amount of a compound of Formula (I) or a form thereof, or a pharmaceutical composition thereof, is administered to a patient to prevent the onset of SMA in a patient at risk of developing SMA. In other embodiments, a prophylactically effective amount of a compound of Formula (I) or a form thereof, or a pharmaceutical composition thereof, is administered to a patient to prevent the onset of SMA in a patient at risk of developing SMA. In other embodiments, a therapeutically effective amount of a compound of Formula (I) or a form thereof, or a pharmaceutical composition thereof, is administered to a patient to prevent the onset of SMA in a patient at risk of developing SMA.

In some embodiments, a compound of Formula (I) or a form thereof, or a pharmaceutical composition thereof, is administered to an SMA patient to treat or ameliorate SMA. In other embodiments, an effective amount of a compound of Formula (I) or a form thereof, or a pharmaceutical composition thereof, is administered to an SMA patient to treat or ameliorate SMA. In other embodiments, a prophylactically effective amount of a compound of Formula (I) or a form thereof, or a pharmaceutical composition thereof, is administered to an SMA patient to prevent advancement of SMA. In other embodiments, a therapeutically effective amount of a compound of Formula (I) or a form thereof, or a pharmaceutical composition thereof, is administered to an SMA patient to treat or ameliorate SMA.

In some embodiments, a compound of Formula (I) or a form thereof, or a medicament thereof is administered to a subject suffering from SMA. In other embodiments, a compound of Formula (I) or a form thereof, is administered to a subject predisposed or susceptible to SMA. In a specific embodiment, a compound of Formula (I) or a form thereof, or a medicament thereof is administered to a human subject having SMA, wherein SMA is caused by an inactivating mutation or deletion in the SMN1 gene on both chromosomes, resulting in a loss of SMN1 gene function. In certain embodiments, the human subject is genotyped prior to administration of a compound of Formula (I) or a form thereof, or a medicament thereof to determine whether the subject has an inactivating mutation or deletion in the teleomeric copy of the SMN1 gene in both chromosomes, which results in a loss of SMN1 gene function. In some embodiments, a compound of Formula (I) or a form thereof, or medicament thereof is administered to a subject with Type 0 SMA. In some embodiments, a compound of Formula (I) or a form thereof, or a medicament thereof is administered to a subject with Type 1 SMA. In other embodiments, a compound of Formula (I) or a form thereof, or a medicament thereof is administered to a subject with Type 2 SMA. In other embodiments, a compound of Formula (I) or a form thereof, or a medicament thereof is administered to a subject with Type 3 SMA. In some embodiments, a compound of Formula (I) or a form thereof, or a medicament thereof is administered to a subject with Type 4 SMA. In certain embodiments, the human subject is an SMA patient.

In certain embodiments, a compound of Formula (I) or a form thereof, or a medicament thereof is administered to a subject that will or might benefit from enhanced inclusion of exon 7 of SMN1 and/or SMN2 into mRNA that is transcribed from the SMN1 and/or SMN2 gene. In specific embodiments, a compound of Formula (I) or a form thereof, or a medicament thereof is administered to a subject that will or may benefit from enhanced Smn protein expression.

In certain embodiments, a compound of Formula (I) or a form thereof, or a medicament thereof is administered to a human that has an age in a range of from about 0 months to about 6 months old, from about 6 to about 12 months old, from about 6 to about 18 months old, from about 18 to about 36 months old, from about 1 to about 5 years old, from about 5 to about 10 years old, from about 10 to about 15 years old, from about 15 to about 20 years old, from about 20 to about 25 years old, from about 25 to about 30 years old, from about 30 to about 35 years old, from about 35 to about 40 years old, from about 40 to about 45 years old, from about 45 to about 50 years old, from about 50 to about 55 years old, from about 55 to about 60 years old, from about 60 to about 65 years old, from about 65 to about 70 years old, from about 70 to about 75 years old, from about 75 to about 80 years old, from about 80 to about 85 years old, from about 85 to about 90 years old, from about 90 to about 95 years old or from about 95 to about 100 years old.

In some embodiments, a compound of Formula (I) or a form thereof, or a medicament thereof is administered to a human infant. In other embodiments, a compound of Formula (I) or a form thereof, or a medicament thereof is administered to a human toddler. In other embodiments, a compound of Formula (I) or a form thereof, or a medicament thereof is administered to a human child. In other embodiments, a compound of Formula (I) or a form thereof, or a medicament thereof is administered to a human adult. In yet other embodiments, a compound of Formula (I) or a form thereof, or a medicament thereof is administered to an elderly human.

In some embodiments, a compound of Formula (I) or a form thereof, or a medicament thereof is administered to a patient to prevent the onset of SMA in a patient at risk of developing SMA. In other embodiments, an effective amount of a compound of Formula (I) or a form thereof, or a medicament thereof, is administered to a patient to prevent the onset of SMA in a patient at risk of developing SMA. In other embodiments, a prophylactically effective amount of a compound of Formula (I) or a form thereof, or a medicament thereof, is administered to a patient to prevent the onset of SMA in a patient at risk of developing SMA. In other embodiments, a therapeutically effective amount of a compound of Formula (I) or a form thereof, or a medicament thereof, is administered to a patient to prevent the onset of SMA in a patient at risk of developing SMA.

In some embodiments, a compound of Formula (I) or a form thereof, or a medicament thereof, is administered to an SMA patient to treat or ameliorate SMA. In other embodiments, an effective amount of a compound of Formula (I) or a form thereof, or a medicament thereof, is administered to an SMA patient to treat or ameliorate SMA. In other embodiments, a prophylactically effective amount of a compound of Formula (I) or a form thereof, or a medicament thereof, is administered to an SMA patient to prevent advancement of SMA. In other embodiments, a therapeutically effective amount of a compound of Formula (I) or a form thereof, or a medicament thereof, is administered to an SMA patient to treat or ameliorate SMA.

Mode of Administration

When administered to a patient, a compound of Formula (I) or a form thereof is preferably administered as a component of a composition that optionally comprises a pharmaceutically acceptable carrier, excipient or diluent. The composition can be administered orally, or by any other convenient route, for example, by infusion or bolus injection, by absorption through epithelial or mucocutaneous linings (e.g., oral mucosa, rectal, and intestinal mucosa) and may be administered together with another biologically active agent. Administration can be systemic or local. Various delivery systems are known, e.g., encapsulation in liposomes, microparticles, microcapsules, capsules, and can be used to administer the compound.

Methods of administration include but are not limited to parenteral, intradermal, intramuscular, intraperitoneal, intravenous, subcutaneous, intranasal, epidural, oral, sublingual, intranasal, intracerebral, intravaginal, transdermal, rectally, by inhalation, or topically, particularly to the ears, nose, eyes, or skin. The mode of administration is left to the discretion of the practitioner. In most instances, administration will result in the release of a compound into the bloodstream. In a specific embodiment, a compound is administered orally.

Dosage and Dosage Forms

The amount of a compound of Formula (I) or a form thereof that will be effective in the treatment of SMA depend, e.g., on the route of administration, the type of SMA, the general health of the subject, ethnicity, age, weight, and gender of the subject, diet, time, and the severity of SMA, and should be decided according to the judgment of the practitioner and each patient's or subject's circumstances.

In specific embodiments, an “effective amount,” “prophylactically effective amount” or “therapeutically effective amount” in the context of the administration of a compound of Formula (I) or a form thereof, or composition or medicament thereof refers to an amount of a compound of Formula (I) which has a therapeutic effect and/or beneficial effect. In certain specific embodiments, an “effective amount,” “prophylactically effective amount” or “therapeutically effective amount” in the context of the administration of a compound of Formula (I) or a form thereof, or composition or medicament thereof results in one, two or more of the following effects: (i) reduces or ameliorates the severity of SMA; (ii) delays onset of SMA; (iii) inhibits the progression of SMA; (iv) reduces hospitalization of a subject; (v) reduces hospitalization length for a subject; (vi) increases the survival of a subject; (vii) improves the quality of life of a subject; (viii) reduces the number of symptoms associated with SMA; (ix) reduces or ameliorates the severity of a symptom(s) associated with SMA; (x) reduces the duration of a symptom associated with SMA; (xi) prevents the recurrence of a symptom associated with SMA; (xii) inhibits the development or onset of a symptom of SMA; and/or (xiii) inhibits of the progression of a symptom associated with SMA. In certain embodiments, an effective amount of a compound of Formula (I) or a form thereof is an amount effective to enhance inclusion of exon 7 of SMN2 into SMN2 mRNA that is transcribed from the SMN2 gene and increases the levels of Smn protein produced from the SMN2 gene and thus producing a desired beneficial effect in a subject in need thereof. In some instances, the desired effect can be determined by analyzing or quantifying: (1) the inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene; or (2) the levels of Smn protein produced from the SMN2 gene. Non-limiting examples of effective amounts of a compound of Formula (I) or a form thereof are described herein.

For example, the effective amount may be the amount required to treat SMA in a human subject in need thereof, or the amount required to enhance inclusion of exon 7 of SMN2 into mRNA that is transcribed from the SMN2 gene in a human subject in need thereof, or the amount required to increase levels of Smn protein produced from the SMN2 gene in a human subject in need thereof. In a specific embodiment, the human subject is an SMA patient.

In general, the effective amount will be in a range of from about 0.001 mg/kg/day to about 500 mg/kg/day for a patient or subject having a weight in a range of between about 1 kg to about 200 kg. The typical adult subject is expected to have a median weight in a range of between about 70 and about 100 kg.

Within the scope of the present description, the “effective amount” of a compound of Formula (I) or a form thereof for use in the manufacture of a medicament, the preparation of a pharmaceutical kit or in a method for treating SMA in a human subject in need thereof, is intended to include an amount in a range of from about 0.001 mg to about 35,000 mg. In a specific embodiment, the human subject is an SMA patient.

The compositions described herein are formulated for administration to the subject via any drug delivery route known in the art. Nonlimiting examples include oral, ocular, rectal, buccal, topical, nasal, ophthalmic, subcutaneous, intramuscular, intraveneous (bolus and infusion), intracerebral, transdermal, and pulmonary routes of administration.

Pharmaceutical Compositions

Embodiments described herein include the use of a compound of Formula (I) or a form thereof in a pharmaceutical composition. In a specific embodiment, described herein is the use of a compound of Formula (I) or a form thereof in a pharmaceutical composition for treating SMA in a human subject in need thereof comprising administering an effective amount of a compound of Formula (I) or a form thereof in admixture with a pharmaceutically acceptable excipient. In a specific embodiment, the human subject is an SMA patient.

A compound of Formula (I) or a form thereof may optionally be in the form of a composition comprising the compound or a form thereof and an optional carrier, excipient or diluent. Other embodiments provided herein include pharmaceutical compositions comprising an effective amount of a compound of Formula (I) or a form thereof and a pharmaceutically acceptable carrier, excipient, or diluent. In a specific embodiment, the pharmaceutical compositions are suitable for veterinary and/or human administration. The pharmaceutical compositions provided herein can be in any form that allows for the composition to be administered to a subject.

In a specific embodiment and in this context, the term “pharmaceutically acceptable carrier, excipient or diluent” means a carrier, excipient or diluent approved by a regulatory agency of the Federal or a state government or listed in the U.S. Pharmacopeia or other generally recognized pharmacopeia for use in animals, and more particularly in humans. The term “carrier” refers to a diluent, adjuvant (e.g., Freund's adjuvant (complete and incomplete)), excipient, or vehicle with which a therapeutic agent is administered. Such pharmaceutical carriers can be sterile liquids, such as water and oils, including those of petroleum, animal, vegetable or synthetic origin, such as peanut oil, soybean oil, mineral oil, sesame oil and the like. Water is a specific carrier for intravenously administered pharmaceutical compositions. Saline solutions and aqueous dextrose and glycerol solutions can also be employed as liquid carriers, particularly for injectable solutions.

Typical compositions and dosage forms comprise one or more excipients. Suitable excipients are well-known to those skilled in the art of pharmacy, and non limiting examples of suitable excipients include starch, glucose, lactose, sucrose, gelatin, malt, rice, flour, chalk, silica gel, sodium stearate, glycerol monostearate, talc, sodium chloride, dried skim milk, glycerol, propylene, glycol, water, ethanol and the like. Whether a particular excipient is suitable for incorporation into a pharmaceutical composition or dosage form depends on a variety of factors well known in the art including, but not limited to, the way in which the dosage form will be administered to a patient and the specific active ingredients in the dosage form. Further provided herein are anhydrous pharmaceutical compositions and dosage forms comprising one or more compounds of Formula (I) or a form thereof as described herein. The compositions and single unit dosage forms can take the form of solutions or syrups (optionally with a flavoring agent), suspensions (optionally with a flavoring agent), emulsions, tablets (e.g., chewable tablets), pills, capsules, granules, powder (optionally for reconstitution), taste-masked or sustained-release formulations and the like.

Pharmaceutical compositions provided herein that are suitable for oral administration can be presented as discrete dosage forms, such as, but are not limited to, tablets, caplets, capsules, granules, powder, and liquids. Such dosage forms contain predetermined amounts of active ingredients, and may be prepared by methods of pharmacy well known to those skilled in the art.

Examples of excipients that can be used in oral dosage forms provided herein include, but are not limited to, binders, fillers, disintegrants, and lubricants.

Biomarkers

In certain embodiments, the amount of mRNA that is transcribed from the SMN1 gene and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 is used as a biomarker for SMA. In certain embodiments, the amount of mRNA that is transcribed from the SMN1 gene and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 is used as a biomarker for SMA. In other embodiments, the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 is used as a biomarker for an SMA patient being treated with a compound, such as disclosed herein. In other embodiments, the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 is used as a biomarker for an SMA patient being treated with a compound, such as disclosed herein. In some embodiments, a change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 and a corresponding change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 is a biomarker for a patient being treated with a compound, such as disclosed herein. In a specific embodiment, the patient is an SMA patient.

In a specific embodiment, an increase in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 and a corresponding decrease in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 after the administration of a compound (e.g., a compound of Formula (I) disclosed herein) indicates that the compound may be effective to treat SMA. In another specific embodiment, a decrease in the amount of mRNA that is transcribed from the SMN2 gene and includes exon 7 of SMN2 and a corresponding increase in the amount of mRNA that is transcribed from the SMN2 gene and does not include exon 7 of SMN2 after the administration of a compound (e.g., a compound of Formula (I) disclosed herein) indicates that the compound will not be effective to treat SMA. In accordance with these embodiments, an SMN primer(s) and/or an SMN probe described below can be used in assays, such as PCR (e.g., qPCR) and RT-PCR (e.g., RT-qPCR or endpoint RT-PCR) to assess and/or quantify the amount of mRNA that is transcribed from the SMN1 gene and/or SMN2 gene and does or does not include exon 7 of SMN1 and/or SMN2.

In one embodiment, provided herein are SMN primers and/or SMN probes (e.g., a forward primer having the nucleotide sequence of SEQ ID NO. 1, 7, 8, 11 or 13; and/or a reverse primer having the nucleotide sequence of SEQ ID NO. 9 or 12; and/or an SMN probe such as a SEQ ID NO. 3 or 10) for amplifying nucleic acids encoding or encoded by human SMN1 and/or SMN2. These primers can be used as primers in, e.g., RT-PCR (such as RT-PCR, endpoint RT-PCR and/or RT-qPCR as described herein or as known to one skilled in the art), PCR (such as qPCR) or rolling circle amplification, and as probes in hybridization assays, such as a Northern blot and/or a Southern blot assay. As utilized in the Biological Examples herein, endpoint RT-PCR is a reverse transcription-polymerase chain reaction that is carried out for a certain number of amplification cycles (or until starting materials are exhausted) following by a quantification of each of the DNA products using, e.g., gel electrophoretic separation, staining with a fluorescent dye, quantification of fluorescence and the like.

SEQ ID NO. 1 hybridizes to DNA or RNA comprising nucleotides corresponding to nucleotides 22 to 40 of exon 7 of SMN1 and/or SMN2, SEQ ID NO. 2 hybridizes to DNA or RNA comprising nucleotides corresponding to nucleotides 4 to 26 of the firefly luciferase coding sequence; SEQ ID NO. 7 hydridizes to nucleic acid sequences (e.g., the sense strand of DNA) comprising nucleotides corresponding to nucleotides 32 to 54 of exon 7 of SMN1 and/or SMN2 and nucleotides 1 to 4 of exon 8 of SMN1 and/or SMN2, SEQ ID NO. 8 hybridizes to nucleic acid sequences (e.g., the sense strand of DNA) comprising nucleotides corresponding, in order, to nucleotides 87 to 111 of exon 7 of SMN1 and/or SMN2 and nucleotides 1 to 3 of exon 8 of SMN1 and/or SMN2, SEQ ID NO. 9 hybridizes to nucleic acid sequences (e.g., the antisense strand of DNA or RNA) comprising nucleotides corresponding to nucleotides 39 to 62 of exon 8 of SMN1 and/or SMN2, SEQ ID NO. 11 hybridizes to nucleic acid sequences (e.g., the sense strand of DNA) comprising nucleotides corresponding to nucleotides 43 to 63 of exon 6 of SMN1 and/or SMN2, SEQ ID NO. 12 hybridizes to nucleic acid sequences (e.g., the antisense strand of DNA or RNA) comprising nucleotides corresponding to nucleotides 51 to 73 of exon 8 of SMN1 and/or SMN2, and SEQ ID NO. 13 hybridizes to nucleic acid sequence (e.g., the sense strand of DNA) comprising nucleotides corresponding to nucleotides 22 to 46 of exon 6 of SMN1 and/or SMN2.

Accordingly, an oligonucleotide corresponding to SEQ ID NO. 9, 11, 12 and/or 13 can be used in an amplification reaction to amplify nucleic acids encoding or encoded by human SMN1 and/or SMN2 lacking exon 7 of human SMN1 and/or SMN2 and nucleic acid encoding or encoded by human SMN1 and/or SMN2 and includes exon 7 of human SMN1 and/or SMN2. In contrast, an oligonucleotide corresponding to SEQ ID NO. 8 in conjunction with a downstream reverse primer (e.g., SEQ ID NO. 9 or 12) can be used to amplify nucleic acids encoding or encoded by human SMN1 and/or SMN2 lacking exon 7 of human SMN1 and/or SMN2 and an oligonucleotide corresponding to SEQ ID NO. 1 and 7 in conjunction with a downstream reverse primer (e.g., SEQ ID NO. 9 or 12) can be used to amplify nucleic acids encoding or encoded by human SMN1 and/or human SMN2 and includes exon 7 of SMN1 and/or SMN2.

SEQ ID NO. 3 hybridizes to nucleic acid sequences (e.g., the sense strand of DNA) comprising nucleotides corresponding, in order, to nucleotides 50 to 54 of exon 7 of human SMN1 and/or SMN2 and nucleotides 1 to 21 of exon 8 of human SMN1 and/or SMN2, and SEQ ID NO. 10 hybridizes to nucleic acid sequences (e.g., the sense strand of DNA) comprising nucleotides corresponding to nucleotides 7 to 36 of exon 8 of human SMN1 and/or SMN2. SEQ ID NO. 3 is useful as a probe to detect mRNA that is transcribed from the minigene and includes exon 7 of SMN1 and/or SMN2, described herein or described in International Publication No. WO 2009/151546 or U.S. Patent Application Publication No. 2011/0086833 (each of which is incorporated herein by reference in its entirety) and to detect mRNA that is transcribed from human SMN1 and/or SMN2 and includes exon 7 of SMN1 and/or SMN2. In addition, SEQ ID NO. 10 is useful as a probe to detect mRNA that is transcribed from the minigene and does or does not include exon 7 of SMN1 and/or SMN2 and to detect mRNA that is transcribed from human SMN1 and/or SMN2, described herein or as described in International Publication No. WO 2009/151546 or U.S. Patent Application Publication No. 2011/0086833, each of which is incorporated herein by reference in its entirety.

In a specific embodiment, a primer and/or probe described below in the Biological Examples (e.g., SMN primers such as SEQ ID NO. 1, 7, 11 or 13 and/or SEQ ID NO. 2, 9 or 12, and/or SMN probes such as a SEQ ID NO. 3 or 10) is used in an assay, such as RT-PCR, RT-qPCR, endpoint RT-PCR, PCR, qPCR, rolling circle amplification and, as applicable, Northern blot or Southern blot (e.g., an assay such as described below in the Biological Examples), to determine whether a compound (e.g., a compound of Formula (I) or a form thereof) enhances the inclusion of exon 7 of SMN1 and/or SMN2 into mRNA that is transcribed from an SMN1 and/or SMN2 gene.

In another embodiment, a primer and/or probe described below in the Biological Examples (e.g., SMN primers such as SEQ ID NO. 1, 7, 11 or 13 and/or SEQ ID NO. 9 or 12, and/or SMN probes such as a SEQ ID NO. 3 or 10) is used in an assay, such as RT-PCR, RT-qPCR, endpoint RT-PCR, PCR, qPCR, rolling circle amplification and, as applicable, Northern blot or Southern blot (e.g., an assay such as described below in the Biological Examples), to monitor the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in a patient sample. In a specific embodiment, the patient is an SMA patient.

In another embodiment, a primer and/or probe described below in the Biological Examples (e.g., SMN primers such as SEQ ID NO. 1, 7, 11 or 13 and/or SEQ ID NO. 9 or 12, and/or SMN probes such as a SEQ ID NO. 3 or 10) is used in an assay, such as RT-PCR, RT-qPCR, endpoint RT-PCR, PCR, qPCR, rolling circle amplification and, as applicable, Northern blot or Southern blot (e.g., an assay such as described below in the Biological Examples), to monitor a patient's response to a compound (e.g., a compound of Formula (I) or a form thereof). In a specific embodiment, the patient is an SMA patient.

A sample (e.g., a blood sample, PBMC sample, or tissue sample, such as a skin or muscle tissue sample) from a patient can be obtained using techniques known to one skilled in the art and the primers and/or probes described in the Biological Examples below can be used in assays (e.g., PCR, RT-PCR, RT-qPCR, qPCR, endpoint RT-PCR, rolling circle amplification, Northern blot and Southern blot) to determine the amount of mRNA that is transcribed from the SMN1 and/or SMN2 genes (e.g., the amount of mRNA that includes exon 7 of SMN2 transcribed from the SMN2 gene). A sample derived from a patient refers to a sample that is processed and/or manipulated after being obtained from the patient using techniques known to one skilled in the art. For example, a sample from a patient can be processed to, e.g., extract RNA, using techniques known to one of skill in the art. A sample from a patient can be processed to, e.g., extract RNA and the RNA is reversed transcribed to produce cDNA. In a specific embodiment, the patient is an SMA patient.

In a specific embodiment, provided herein is a method for detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2, comprising: (a) contacting a patient sample (e.g., blood sample or tissue sample) or a sample derived from a patient (e.g., a blood sample or tissue sample that has been processed to extract RNA) with a forward SMN primer described below (e.g., SEQ ID NO. 1, 7, 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) along with applicable components for, e.g., an RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification; and (b) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2. In certain embodiments, the sample is from or derived from a patient administered a compound, such as a compound of Formula (I) or a form thereof as described herein. In a specific embodiment, the patient is an SMA patient.

In another specific embodiment, provided herein is a method for detecting the amount of mRNA that is transcribed from the SMN1 and SMN2 genes, comprising: (a) contacting a patient sample (e.g., blood sample or tissue sample) or a sample derived from a patient (e.g., a blood sample or tissue sample that has been processed to extract RNA) with a forward SMN primer described below (e.g., SEQ ID NO. 1, 7, 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) along with applicable components for, e.g., an RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification; and (b) detecting the amount of mRNA that is transcribed from the SMN1 and SMN2 genes. In certain embodiments, the sample is from or derived from a patient administered a compound, such as a compound of Formula (I) or a form thereof as described herein. In a specific embodiment, the patient is an SMA patient.

The amount of mRNA that is transcribed from the human SMN1 and SMN2 genes that includes exon 7 of SMN1 and SMN2 and the amount of mRNA that is transcribed from the human SMN1 and SMN2 genes and does not include exon 7 of SMN1 and SMN2 can be differentiated from each other by, e.g., size of the RNA or DNA fragment generated from SMN1 and SMN2 mRNA that includes exon 7 of SMN1 and SMN2 and from SMN1 and SMN2 mRNA that do not include exon 7 of SMN1 and SMN2.

In another specific embodiment, provided herein is a method for detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2, comprising: (a) contacting a patient sample (e.g., blood sample or tissue sample) or a sample derived from a patient (e.g., a blood sample or tissue sample that has been processed to extract RNA) with a forward SMN primer described below (e.g., SEQ ID NO. 8, 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) along with applicable components for, e.g., an RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification; and (b) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2. In certain embodiments, the sample is from or derived from a patient administered a compound, such as a compound of Formula (I) or a form thereof as described herein. In a specific embodiment, the patient is an SMA patient.

In another specific embodiment, provided herein is a method for detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2, comprising: (a) contacting a patient sample (e.g., blood sample or tissue sample) or a sample derived from a patient (e.g., a blood sample or tissue sample that has been processed to extract RNA) with an SMN probe described below (e.g., SEQ ID NO. 3 or 10) along with applicable components, e.g., of an RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR), rolling circle amplification and, as applicable, Northern blot or Southern blot; and (b) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2. In certain embodiments, the sample is from or derived from a patient administered a compound, such as a compound of Formula (I) or a form thereof as described herein. In a specific embodiment, the patient is an SMA patient.

In another specific embodiment, provided herein is a method for detecting the amount of mRNA that is transcribed from the SMN1 and SMN2 genes, comprising: (a) contacting a patient sample (e.g., blood sample or tissue sample) or a sample derived from a patient (e.g., a blood sample or tissue sample that has been processed to extract RNA) with an SMN probe described below (e.g., SEQ ID NO. 3 or 10) along with applicable components for, e.g., an RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR), rolling circle amplification and, as applicable, Northern blot or Southern blot; and (b) detecting the amount of mRNA that is transcribed from the SMN1 and SMN2 genes.

The amount of mRNA that is transcribed from the human SMN1 and SMN2 genes that includes exon 7 of SMN1 and SMN2 and the amount of mRNA that is transcribed from the human SMN1 and SMN2 genes and does not include exon 7 of SMN1 and SMN2 can be differentiated from each other by, e.g., size of the RNA or DNA fragment generated from SMN1 and SMN2 mRNA that includes exon 7 of SMN1 and SMN2 and from SMN1 and SMN2 mRNA that do not include exon 7 of SMN1 and SMN2. In certain embodiments, the sample is from or derived from a patient administered a compound, such as a compound of Formula (I) or a form thereof as described herein. In a specific embodiment, the patient is an SMA patient.

In another specific embodiment, provided herein is a method for detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2, comprising: (a) contacting a patient sample (e.g., blood sample or tissue sample) or a sample derived from a patient (e.g., a blood sample or tissue sample that has been processed to extract RNA) with an SMN probe described below (e.g., SEQ ID NO. 10) along with applicable components for, e.g., an RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR), rolling circle amplification, or Northern blot or Southern blot; and (b) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2. In certain embodiments, the sample is from or derived from a patient administered a compound, such as a compound of Formula (I) or a form thereof as described herein. In a specific embodiment, the patient is an SMA patient.

In a specific embodiment, provided herein is a method for detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2, comprising: (a) contacting a patient sample (e.g., blood sample or tissue sample) or a sample derived from a patient (e.g., a blood sample or tissue sample that has been processed to extract RNA) with a forward SMN primer described below (e.g., SEQ ID NO. 1, 7, 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) and/or an SMN probe described herein (e.g., SEQ ID NO. 3 or 10) along with applicable components for e.g., an RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification; and (b) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2. In certain embodiments, the sample is from or derived from a patient administered a compound, such as a compound of Formula (I) or a form thereof as described herein. In a specific embodiment, the patient is an SMA patient.

In a specific embodiment, provided herein is a method for detecting the amount of mRNA that is transcribed from the SMN1 and SMN2 genes, comprising: (a) contacting a patient sample (e.g., blood sample or tissue sample) or a sample derived from a patient (e.g., a blood sample or tissue sample that has been processed to extract RNA) with a forward SMN primer described below (e.g., SEQ ID NO. 1, 7, 8, 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) and/or an SMN probe described herein (e.g., SEQ ID NO. 3 or 10) along with applicable components for e.g., an RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification, as applicable; and (b) detecting the amount of mRNA that is transcribed from the SMN1 and SMN2 genes. In a specific embodiment, the patient is an SMA patient.

The amount of mRNA that is transcribed from the human SMN1 and SMN2 genes that includes exon 7 of SMN1 and SMN2 and the amount of mRNA that is transcribed from the human SMN1 and SMN2 genes that do not include exon 7 of SMN1 and SMN2 can be differentiated from each other by, e.g., size of the RNA or DNA fragment generated from SMN1 and SMN2 mRNA that includes exon 7 of SMN1 and SMN2 and from SMN1 and SMN2 mRNA that does not include exon 7 of SMN1 and SMN2. In certain embodiments, the sample is from or derived from a patient administered a compound, such as a compound of Formula (I) or a form thereof as described herein. In a specific embodiment, the patient is an SMA patient.

In a specific embodiment, provided herein is a method for detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2, comprising: (a) contacting a patient sample (e.g., blood sample or tissue sample) or a sample derived from a patient (e.g., a blood sample or tissue sample that has been processed to extract RNA) with a forward SMN primer described below (e.g., SEQ ID NO. 8) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) and/or an SMN probe described herein (e.g., SEQ ID NO. 10) along with applicable components for e.g., an RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification; and (b) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2. In certain embodiments, the sample is from or derived from a patient administered a compound, such as a compound of Formula (I) or a form thereof as described herein. In a specific embodiment, the patient is an SMA patient.

In a specific embodiment, provided herein is a method for assessing an SMA patient's response to a compound, comprising: (a) contacting an SMA patient sample (e.g., blood sample or tissue sample) or a sample derived from an SMA patient (e.g., a blood sample or tissue sample that has been processed to extract RNA) with a forward SMN primer described below (e.g., SEQ ID NO. 1, 7, 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) along with applicable components for e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification, wherein the sample is from or derived from an SMA patient administered a compound (e.g., a compound described herein); and (b) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2, wherein (1) an increase in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound indicates that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., the same type of tissue sample) from the patient prior to administration of the compound indicates that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is assessed 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In another specific embodiment, provided herein is a method for assessing an SMA patient's response to a compound, comprising: (a) administering a compound to an SMA patient; (b) contacting a sample (e.g., blood sample or tissue sample) obtained or derived from the patient with a forward SMN primer described below (e.g., SEQ ID NO. 1, 7, 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) along with applicable components for e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification; and (c) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN2, wherein (1) an increase in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound indicates that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound indicates that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is assessed 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In a specific embodiment, provided herein is a method for assessing an SMA patient's response to a compound, comprising: (a) contacting an SMA patient sample (e.g., blood sample or tissue sample) or a sample derived from an SMA patient (e.g., a blood sample or tissue sample that has been processed to extract RNA) with a forward SMN primer described below (e.g., SEQ ID NO. 1, 7, 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) and/or an SMN probe (e.g., SEQ ID NO. 3 or 10) along with applicable components for e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification, wherein the sample is from or derived from an SMA patient administered a compound (e.g., a compound of Formula (I) or a form thereof as described herein); and (b) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2, wherein (1) an increase in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound indicates that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound indicates that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is assessed 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In another specific embodiment, provided herein is a method for assessing an SMA patient's response to a compound, comprising: (a) administering a compound to an SMA patient; (b) contacting a sample (e.g., blood sample or tissue sample) obtained or derived from the patient with a forward SMN primer described below (e.g., SEQ ID NO. 1, 7, 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) and/or an SMN probe (e.g., SEQ ID NO. 3 or 10) along with applicable components for e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification; and (c) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2, wherein (1) an increase in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound indicates that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound indicates that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is assessed 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In a specific embodiment, provided herein is a method for assessing an SMA patient's response to a compound, comprising: (a) contacting an SMA patient sample (e.g., blood sample or tissue sample) or a sample derived from an SMA patient (e.g., a blood sample or tissue sample that has been processed to extract RNA) with a forward SMN primer described below (e.g., SEQ ID NO. 8, 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) along with applicable components for e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification, wherein the sample is from or derived from an SMA patient administered a compound (e.g., a compound of Formula (I) or a form thereof as described herein); and (b) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2, wherein (1) a decrease in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound indicates that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound indicates that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is assessed 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In another specific embodiment, provided herein is a method for assessing an SMA patient's response to a compound, comprising: (a) administering a compound to an SMA patient; (b) contacting a sample (e.g., blood sample or tissue sample) obtained or derived from the patient with a forward SMN primer described below (e.g., SEQ ID NO. 8, 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) along with applicable components for e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification; and (c) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2, wherein (1) a decrease in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound indicates that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound indicates that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is assessed 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In a specific embodiment, provided herein is a method for assessing an SMA patient's response to a compound, comprising: (a) contacting an SMA patient sample (e.g., blood sample or tissue sample) or a sample derived from an SMA patient (e.g., a blood sample or tissue sample that has been processed to extract RNA) with a forward SMN primer described below (e.g., SEQ ID NO. 8, 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) and/or an SMN probe (e.g., SEQ ID NO. 10) along with applicable components for e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification, wherein the sample is from or derived from an SMA patient administered a compound (e.g., a compound of Formula (I) or a form thereof as described herein); and (b) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2, wherein (1) a decrease in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound indicates that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound indicates that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is assessed 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In another specific embodiment, provided herein is a method for assessing an SMA patient's response to a compound, comprising: (a) administering a compound to an SMA patient; (b) contacting a sample (e.g., blood sample or tissue sample) obtained or derived from the patient with a forward SMN primer described below (e.g., SEQ ID NO. 8, 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) and/or an SMN probe (e.g., SEQ ID NO. 10) along with applicable components for e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification; and (c) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2, wherein (1) a decrease in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound indicates that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound indicates that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is assessed 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In a specific embodiment, provided herein is a method for assessing an SMA patient's response to a compound, comprising: (a) contacting an SMA patient sample (e.g., blood sample or tissue sample) or a sample derived from an SMA patient (e.g., a blood sample or tissue sample that has been processed to extract RNA) with a forward SMN primer described below (e.g., SEQ ID NO. 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) along with applicable components for e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification, wherein the sample is from or derived from an SMA patient administered a compound (e.g., a compound of Formula (I) or a form thereof as described herein); and (b) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 and the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2, wherein (1)(i) an increase in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound, and (ii) a decrease in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound, indicate that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2)(i) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., the same type of tissue sample) from the patient prior to administration of the compound, and (ii) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., the same type of tissue sample) from the patient prior to administration of the compound, indicates that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is assessed 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In another specific embodiment, provided herein is a method for assessing an SMA patient's response to a compound, comprising: (a) administering a compound to an SMA patient; (b) contacting a sample (e.g., blood sample or tissue sample) obtained or derived from the patient with a forward SMN primer described below (e.g., SEQ ID NO. 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) along with applicable components for e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification; and (c) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 and the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2, wherein (1)(i) an increase in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound, and (ii) a decrease in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound, indicate that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2)(i) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., the same type of tissue sample) from the patient prior to administration of the compound, and (ii) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., the same type of tissue sample) from the patient prior to administration of the compound, indicate that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is assessed 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In a specific embodiment, provided herein is a method for assessing an SMA patient's response to a compound, comprising: (a) contacting an SMA patient sample (e.g., blood sample or tissue sample) or a sample derived from an SMA patient (e.g., a blood sample or tissue sample that has been processed to extract RNA) with an SMN probe (e.g., SEQ ID NO. 10) along with applicable components for e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification, wherein the sample is from or derived from an SMA patient administered a compound (e.g., a compound of Formula (I) or a form thereof as described herein); and (b) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 and the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2, wherein (1)(i) an increase in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound, and (ii) a decrease in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound, indicate that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2)(i) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., the same type of tissue sample) from the patient prior to administration of the compound, and (ii) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., the same type of tissue sample) from the patient prior to administration of the compound, indicate that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is assessed 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In another specific embodiment, provided herein is a method for assessing an SMA patient's response to a compound, comprising: (a) administering a compound to an SMA patient; (b) contacting a sample (e.g., blood sample or tissue sample) obtained or derived from the patient with an SMN probe (e.g., SEQ ID NO. 10) along with applicable components for e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification; and (c) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 and the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2, wherein (1)(i) an increase in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound, and (ii) a decrease in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound, indicate that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2)(i) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., the same type of tissue sample) from the patient prior to administration of the compound, and (ii) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., the same type of tissue sample) from the patient prior to administration of the compound, indicate that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is assessed 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In a specific embodiment, provided herein is a method for assessing an SMA patient's response to a compound, comprising: (a) contacting an SMA patient sample (e.g., blood sample or tissue sample) or a sample derived from an SMA patient (e.g., a blood sample or tissue sample that has been processed to extract RNA) with a forward SMN primer described below (e.g., SEQ ID NO. 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) and/or an SMN probe (e.g., SEQ ID NO. 10) along with applicable components for e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR) or PCR (e.g., qPCR), wherein the sample is from or derived from an SMA patient administered a compound (e.g., a compound of Formula (I) or a form thereof as described herein); and (b) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 and the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2, wherein (1)(i) an increase in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound, and (ii) a decrease in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound, indicate that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2)(i) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., the same type of tissue sample) from the patient prior to administration of the compound, and (ii) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., the same type of tissue sample) from the patient prior to administration of the compound, indicate that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is assessed 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In another specific embodiment, provided herein is a method for assessing an SMA patient's response to a compound, comprising: (a) administering a compound to an SMA patient; (b) contacting a sample (e.g., blood sample or tissue sample) obtained or derived from the patient with a forward SMN primer described below (e.g., SEQ ID NO. 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) and/or an SMN probe (e.g., SEQ ID NO. 10) along with applicable components for, e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification; and (c) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 and the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2, wherein (1)(i) an increase in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound, and (ii) a decrease in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound, indicate that the SMN1 and/or patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2)(i) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., the same type of tissue sample) from the patient prior to administration of the compound, and (ii) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., the same type of tissue sample) from the patient prior to administration of the compound, indicate that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is assessed 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In a specific embodiment, provided herein is a method for monitoring an SMA patient's responsiveness to a compound, comprising: (a) contacting an SMA patient sample (e.g., blood sample or tissue sample) or a sample derived from an SMA patient (e.g., a blood sample or tissue sample that has been processed to extract RNA) with a forward SMN primer described below (e.g., SEQ ID NO. 1, 7, 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) along with applicable components for e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification, wherein the sample is from or derived from an SMA patient administered a compound (e.g., a compound of Formula (I) or a form thereof as described herein); and (b) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2, wherein (1) an increase in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to the administration of the compound or a certain number of doses of the compound, or a certain earlier date indicates that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to the administration of the compound or a certain number of doses of the compound, or a certain earlier date indicates that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is monitored 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 4 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the patient has received 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 or more doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the administration of 1-5, 5-10, 10-15, 15-20, 20-30, 30-40, 40-50, or 50-100 doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored over a period of days, weeks, months or years during or after the continuous administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In another specific embodiment, provided herein is a method for monitoring an SMA patient's responsiveness to a compound, comprising: (a) administering a compound to an SMA patient; (b) contacting a sample (e.g., blood sample or tissue sample) obtained or derived from the patient with a forward SMN primer described below (e.g., SEQ ID NO. 1, 7, 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) along with applicable components for, e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification; and (c) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2, wherein (1) an increase in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to the administration of the compound or a certain number of doses of the compound, or a certain earlier date indicates that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to the administration of the compound or a certain number of doses of the compound, or a certain earlier date indicates that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is monitored 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 4 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the patient has received 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 or more doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the administration of 1-5, 5-10, 10-15, 15-20, 20-30, 30-40, 40-50, or 50-100 doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored over a period of days, weeks, months or years during or after the continuous administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In a specific embodiment, provided herein is a method for monitoring an SMA patient's responsiveness to a compound, comprising: (a) contacting an SMA patient sample (e.g., blood sample or tissue sample) or a sample derived from an SMA patient (e.g., a blood sample or tissue sample that has been processed to extract RNA) with a forward SMN primer described below (e.g., SEQ ID NO. 1, 7, 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) and/or an SMN probe (e.g., SEQ ID NO. 3 or 10) along with applicable components for e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification, wherein the sample is from or derived from an SMA patient administered a compound (e.g., a compound of Formula (I) or a form thereof as described herein); and (b) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2, wherein (1) an increase in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to the administration of the compound or a certain number of doses of the compound, or a certain earlier date indicates that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to the administration of the compound or a certain number of doses of the compound, or a certain earlier date indicates that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is monitored 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 4 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the patient has received 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 or more doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the administration of 1-5, 5-10, 10-15, 15-20, 20-30, 30-40, 40-50, or 50-100 doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored over a period of days, weeks, months or years during or after the continuous administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In another specific embodiment, provided herein is a method for monitoring an SMA patient's responsiveness to a compound, comprising: (a) administering a compound to an SMA patient; (b) contacting a sample (e.g., blood sample or tissue sample) obtained or derived from the patient with a forward SMN primer described below (e.g., SEQ ID NO. 1, 7, 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) and/or an SMN probe (e.g., SEQ ID NO. 3 or 10) along with applicable components for, e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification; and (c) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2, wherein (1) an increase in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to the administration of the compound or a certain number of doses of the compound, or a certain earlier date indicates that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to the administration of the compound or a certain number of doses of the compound, or a certain earlier date indicates that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is monitored 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 4 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the patient has received 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 or more doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the administration of 1-5, 5-10, 10-15, 15-20, 20-30, 30-40, 40-50, or 50-100 doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored over a period of days, weeks, months or years during or after the continuous administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In a specific embodiment, provided herein is a method for monitoring an SMA patient's responsiveness to a compound, comprising: (a) contacting an SMA patient sample (e.g., blood sample or tissue sample) or a sample derived from an SMA patient (e.g., a blood sample or tissue sample that has been processed to extract RNA) with a forward SMN primer described below (e.g., SEQ ID NO. 8, 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) along with applicable components for, e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification, wherein the sample is from or derived from an SMA patient administered a compound (e.g., a compound of Formula (I) or a form thereof as described herein); and (b) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2, wherein (1) a decrease in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to the administration of the compound or a certain number of doses of the compound, or a certain earlier date indicates that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to the administration of the compound or a certain number of doses of the compound, or a certain earlier date indicates that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is monitored 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 4 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the patient has received 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 or more doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the administration of 1-5, 5-10, 10-15, 15-20, 20-30, 30-40, 40-50, or 50-100 doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored over a period of days, weeks, months or years during or after the continuous administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In another specific embodiment, provided herein is a method for monitoring an SMA patient's responsiveness to a compound, comprising: (a) administering a compound to an SMA patient; (b) contacting a sample (e.g., blood sample or tissue sample) obtained or derived from the patient with a forward SMN primer described below (e.g., SEQ ID NO. 8, 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) along with applicable components for, e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification; and (c) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2, wherein (1) a decrease in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to the administration of the compound or a certain number of doses of the compound, or a certain earlier date indicates that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to the administration of the compound or a certain number of doses of the compound, or a certain earlier date indicates that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is monitored 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 4 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the patient has received 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 or more doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the administration of 1-5, 5-10, 10-15, 15-20, 20-30, 30-40, 40-50, or 50-100 doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored continuous administration of a compound over a period of days, weeks, months or years, such as a compound of Formula (I) or a form thereof as described herein.

In a specific embodiment, provided herein is a method for monitoring an SMA patient's responsiveness to a compound, comprising: (a) contacting an SMA patient sample (e.g., blood sample or tissue sample) or a sample derived from an SMA patient (e.g., a blood sample or tissue sample that has been processed to extract RNA) with a forward SMN primer described below (e.g., SEQ ID NO. 8, 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) and/or an SMN probe (e.g., SEQ ID NO. 10) along with applicable components for, e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification, wherein the sample is from or derived from a patient administered a compound (e.g., a compound of Formula (I) or a form thereof as described herein); and (b) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2, wherein (1) a decrease in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to the administration of the compound or a certain number of doses of the compound, or a certain earlier date indicates that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to the administration of the compound or a certain number of doses of the compound, or a certain earlier date indicates that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is monitored 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 4 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the patient has received 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 or more doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the administration of 1-5, 5-10, 10-15, 15-20, 20-30, 30-40, 40-50, or 50-100 doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored over a period of days, weeks, months or years during or after the continuous administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In another specific embodiment, provided herein is a method for monitoring an SMA patient's responsiveness to a compound, comprising: (a) administering a compound to an SMA patient; (b) contacting a sample (e.g., blood sample or tissue sample) obtained or derived from the patient with a forward SMN primer described below (e.g., SEQ ID NO. 8, 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) and/or an SMN probe (e.g., SEQ ID NO. 10) along with applicable components for, e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification; and (c) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2, wherein (1) a decrease in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to the administration of the compound or a certain number of doses of the compound, or a certain earlier date indicates that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to the administration of the compound or a certain number of doses of the compound, or a certain earlier date indicates that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is monitored 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 4 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the patient has received 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 or more doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the administration of 1-5, 5-10, 10-15, 15-20, 20-30, 30-40, 40-50, or 50-100 doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored over a period of days, weeks, months or years during or after the continuous administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In a specific embodiment, provided herein is a method for monitoring an SMA patient's response to a compound, comprising: (a) contacting an SMA patient sample (e.g., blood sample or tissue sample) or a sample derived from an SMA patient (e.g., a blood sample or tissue sample that has been processed to extract RNA) with a forward SMN primer described below (e.g., SEQ ID NO. 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) along with applicable components for, e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification, wherein the sample is from or derived from an SMA patient administered a compound (e.g., a compound of Formula (I) or a form thereof as described herein); and (b) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 and the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2, wherein (1)(i) an increase in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound or a certain number of doses of the compound, or a certain earlier date, and (ii) a decrease in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound or a certain number of doses of the compound, or a certain earlier date, indicate that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2)(i) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., the same type of tissue sample) from the patient prior to administration of the compound or a certain number of doses of the compound, or a certain earlier date, and (ii) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., the same type of tissue sample) from the patient prior to administration of the compound or a certain number of doses of the compound, or a certain earlier date, indicate that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is monitored 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 4 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the patient has received 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 or more doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the administration of 1-5, 5-10, 10-15, 15-20, 20-30, 30-40, 40-50, or 50-100 doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored over a period of days, weeks, months or years during or after the continuous administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In another specific embodiment, provided herein is a method for monitoring an SMA patient's response to a compound, comprising: (a) administering a compound to an SMA patient; (b) contacting a sample (e.g., blood sample or tissue sample) obtained or derived from the patient with a forward SMN primer described below (e.g., SEQ ID NO. 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) along with applicable components for, e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR), or rolling circle amplification; and (c) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 and the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2, wherein (1)(i) an increase in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound or a certain number of doses of the compound, or a certain earlier date, and (ii) a decrease in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound or a certain number of doses of the compound, or a certain earlier date, indicate that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2)(i) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., the same type of tissue sample) from the patient prior to administration of the compound or a certain number of doses of the compound, or a certain earlier date, and (ii) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., the same type of tissue sample) from the patient prior to administration of the compound or a certain number of doses of the compound, or a certain earlier date, indicate that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is monitored 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 4 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the patient has received 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 or more doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the administration of 1-5, 5-10, 10-15, 15-20, 20-30, 30-40, 40-50, or 50-100 doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored over a period of days, weeks, months or years during or after the continuous administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In a specific embodiment, provided herein is a method for monitoring an SMA patient's response to a compound, comprising: (a) contacting an SMA patient sample (e.g., blood sample or tissue sample) or a sample derived from an SMA patient (e.g., a blood sample or tissue sample that has been processed to extract RNA) with an SMN probe (e.g., SEQ ID NO. 10) along with applicable components for, e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification, wherein the sample is from or derived from an SMA patient administered a compound (e.g., a compound of Formula (I) or a form thereof as described herein); and (b) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 and the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2, wherein (1)(i) an increase in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of S SMN1 and/or MN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound or a certain number of doses of the compound, or a certain earlier date, and (ii) a decrease in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound or a certain number of doses of the compound, or a certain earlier date, indicate that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2)(i) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., the same type of tissue sample) from the patient prior to administration of the compound or a certain number of doses of the compound, or a certain earlier date, and (ii) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., the same type of tissue sample) from the patient prior to administration of the compound or a certain number of doses of the compound, or a certain earlier date, indicate that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is monitored 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 4 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the patient has received 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 or more doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the administration of 1-5, 5-10, 10-15, 15-20, 20-30, 30-40, 40-50, or 50-100 doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored over a period of days, weeks, months or years during or after the continuous administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In another specific embodiment, provided herein is a method for monitoring an SMA patient's response to a compound, comprising: (a) administering a compound to an SMA patient; (b) contacting a sample (e.g., blood sample or tissue sample) obtained or derived from the patient with an SMN probe (e.g., SEQ ID NO. 10) along with applicable components for, e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification; and (c) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 and the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2, wherein (1)(i) an increase in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound or a certain number of doses of the compound, or a certain earlier date, and (ii) a decrease in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound or a certain number of doses of the compound, or a certain earlier date, indicate that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2)(i) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., the same type of tissue sample) from the patient prior to administration of the compound or a certain number of doses of the compound, or a certain earlier date, and (ii) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., the same type of tissue sample) from the patient prior to administration of the compound or a certain number of doses of the compound, or a certain earlier date, indicate that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is monitored 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 4 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the patient has received 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 or more doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the administration of 1-5, 5-10, 10-15, 15-20, 20-30, 30-40, 40-50, or 50-100 doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored over a period of days, weeks, months or years during or after the continuous administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In a specific embodiment, provided herein is a method for monitoring an SMA patient's response to a compound, comprising: (a) contacting an SMA patient sample (e.g., blood sample or tissue sample) or a sample derived from an SMA patient (e.g., a blood sample or tissue sample that has been processed to extract RNA) with a forward SMN primer described below (e.g., SEQ ID NO. 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) and/or an SMN probe (SEQ ID NO. 10) along with applicable components for, e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification, wherein the sample is from or derived from an SMA patient administered a compound (e.g., a compound of Formula (I) or a form thereof as described herein); and (b) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 and the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2, wherein (1)(i) an increase in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound or a certain number of doses of the compound, or a certain earlier date, and (ii) a decrease in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound or a certain number of doses of the compound, or a certain earlier date, indicate that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2)(i) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., the same type of tissue sample) from the patient prior to administration of the compound or a certain number of doses of the compound, or a certain earlier date, and (ii) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., the same type of tissue sample) from the patient prior to administration of the compound or a certain number of doses of the compound, or a certain earlier date, indicate that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is monitored 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 4 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the patient has received 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 or more doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the administration of 1-5, 5-10, 10-15, 15-20, 20-30, 30-40, 40-50, or 50-100 doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored over a period of days, weeks, months or years during or after the continuous administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In another specific embodiment, provided herein is a method for monitoring an SMA patient's response to a compound, comprising: (a) administering a compound to an SMA patient; (b) contacting a sample (e.g., blood sample or tissue sample) obtained or derived from the patient with a forward SMN primer described below (e.g., SEQ ID NO. 11 or 13) and/or a reverse SMN primer described herein (e.g., SEQ ID NO. 9 or 12) and/or an SMN probe (SEQ ID NO. 10) along with applicable components for, e.g., RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification; and (c) detecting the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 and the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2, wherein (1)(i) an increase in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound or a certain number of doses of the compound, or a certain earlier date, and (ii) a decrease in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., from the same type of tissue sample) from the patient prior to administration of the compound or a certain number of doses of the compound, or a certain earlier date, indicate that the patient is responsive to the compound and that the compound may be or is beneficial and/or of therapeutic value to the patient; and (2)(i) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., the same type of tissue sample) from the patient prior to administration of the compound or a certain number of doses of the compound, or a certain earlier date, and (ii) no change or no substantial change in the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in the patient sample relative to the amount of mRNA that is transcribed from the SMN2 gene and does not include exon 7 of SMN1 and/or SMN2 in an analogous sample (e.g., the same type of tissue sample) from the patient prior to administration of the compound or a certain number of doses of the compound, or a certain earlier date, indicate that the patient is not responsive to the compound and that the compound is not beneficial and/or of therapeutic value to the patient. In certain embodiments, the patient's response is monitored 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 1 day, 2 days, 3 days, 4 days, 5 days, 7 days, 14 days, 28 days, 1 month, 2 months, 3 months, 6 months, 9 months, 12 months or more after administration of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the patient has received 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 or more doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored after the administration of 1-5, 5-10, 10-15, 15-20, 20-30, 30-40, 40-50, or 50-100 doses of a compound, such as a compound of Formula (I) or a form thereof as described herein. In some embodiments, the patient's response is monitored over a period of days, weeks, months or years during or after the continuous administration of a compound, such as a compound of Formula (I) or a form thereof as described herein.

In specific embodiments, SMA in a patient is caused by an inactivating mutation or deletion in the SMN1 gene on both chromosomes, resulting in a loss of SMN1 gene function.

Kits

In one aspect, provided herein are pharmaceutical or assay kits comprising an SMN primer or probe described herein, in one or more containers, and instructions for use. In one embodiment, a pharmaceutical or assay kit comprises, in a container, one or more SMN reverse primers (e.g., SEQ ID NO. 2, 9 and/or 12) and/or one or more SMN forward primers (SEQ ID NO. 1, 7, 8, 11 and/or 13)) and instructions for use. In another embodiment, a pharmaceutical or assay kit comprises, in one container, an SMN reverse primer (e.g., SEQ ID NO. 2, 9 or 12), an SMN forward primer (SEQ ID NO. 1, 7, 8, 11 or 13)) and instructions for use.

In one embodiment, a pharmaceutical or assay kit comprises, in separate containers, one SMN reverse primer (e.g., SEQ ID NO. 2, 9 or 12) in one container, another SMN forward primer (e.g., SEQ ID NO. 1, 7, 8, 11 or 13)) in another container, and instructions for use.

In certain embodiments, applicable components needed for a PCR (e.g., qPCR), RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR) or rolling circle amplification, such as polymerase, deoxynucleoside triphosphates, etc., are included in such kits. In some embodiments, components needed for hybridization are included in such kits. A pharmaceutical or assay kit containing such primers can be used in PCR and RT-PCR to, e.g.: (i) assess whether a therapeutic agent (e.g., a compound of Formula (I) or a form thereof) enhances inclusion of exon 7 of SMN1 and/or SMN2 into mRNA that is transcribed from the SMN1 and/or SMN2 gene, (ii) monitor the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 of SMN1 and/or SMN2 and the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2, and/or (iii) monitor a subject's response to a therapeutic agent (e.g., a compound of Formula (I) or a form thereof). In other embodiments, the subject is a human subject. In other embodiments, the human subject is a human patient. In certain other embodiments, the human patient is a human SMA patient.

In a specific embodiment, a pharmaceutical or assay kit comprises the forward primer with the sequence found in SEQ ID NO. 1, in a container, and the reverse primer with the sequence found in SEQ ID NO. 2, in another container. In certain embodiments, these primers are used in RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification for amplifying nucleotide sequences encoded by a human SMN1 minigene or human SMN2 minigene, such as described those described herein or in International Publication No. WO 2009/151546 or U.S. Patent Application Publication No. 2011/0086833, each of which is incorporated herein by reference in its entirety. In other embodiments, these primers are used as probes in, e.g., hybridization assays, such as Southern blot or Northern blot.

In a specific embodiment, a pharmaceutical or assay kit comprises the forward primer with the nucleotide sequence found in SEQ ID NO. 7, in a container, and the reverse primer with the nucleotide sequence found in SEQ ID NO. 9, in another container. In certain embodiments, these primers are used in RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification for amplifying nucleotide sequences encoded by endogenous human SMN1 and SMN2 genes. In other embodiments, these primers are used as probes in, e.g., hybridization assays, such as Southern blot or Northern blot.

In another specific embodiment, a pharmaceutical or assay kit comprises the forward primer with the nucleotide sequence found in SEQ ID NO. 8, in a container, and the reverse primer with the nucleotide sequence found in SEQ ID NO. 9, in another container. In certain embodiments, these primers are used in RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification for amplifying nucleotide sequences encoded by the endogenous human SMN2 gene. In other embodiments, these primers are used as probes in, e.g., hybridization assays, such as Southern blot or Northern blot.

In a specific embodiment, a pharmaceutical or assay kit comprises the forward primer with the nucleotide sequence found in SEQ ID NO. 7, in a container, the forward primer with the nucleotide sequence found in SEQ ID NO. 8, in another container, and the reverse primer with the nucleotide sequence found in SEQ ID NO. 9, in another container. In certain embodiments, these primers are used in RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification for amplifying nucleotide sequences encoded by endogenous human SMN1 and SMN2 genes. In other embodiments, these primers are used as probes in, e.g., hybridization assays, such as Southern blot or Northern blot.

In a specific embodiment, a pharmaceutical or assay kit comprises the forward primer with the nucleotide sequence found in SEQ ID NO. 11, in a container, and the reverse primer with the nucleotide sequence found in SEQ ID NO. 12, in another container. In certain embodiments, these primers are used in RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification for amplifying nucleotide sequences encoded by endogenous human SMN1 and SMN2 genes. In other embodiments, these primers are used as probes in, e.g., hybridization assays, such as Southern blot or Northern blot.

In a specific embodiment, a pharmaceutical or assay kit comprises the forward primer with the nucleotide sequence found in SEQ ID NO. 11, in a container, and the reverse primer with the nucleotide sequence found in SEQ ID NO. 9, in another container. In certain embodiments, these primers are used in RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification for amplifying nucleotide sequences encoded by endogenous human SMN1 and SMN2 genes. In other embodiments, these primers are used as probes in, e.g., hybridization assays, such as Southern blot or Northern blot.

In a specific embodiment, a pharmaceutical or assay kit comprises the forward primer with the nucleotide sequence found in SEQ ID NO. 13, in a container, and the reverse primer with the nucleotide sequence found in SEQ ID NO. 12, in another container. In certain embodiments, these primers are used in RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification for amplifying nucleotide sequences encoded by endogenous human SMN1 and SMN2 genes. In other embodiments, these primers are used as probes in, e.g., hybridization assays, such as Southern blot or Northern blot.

In a specific embodiment, a pharmaceutical or assay kit comprises the forward primer with the nucleotide sequence found in SEQ ID NO. 13, in a container, and the reverse primer with the nucleotide sequence found in SEQ ID NO. 9, in another container. In certain embodiments, these primers are used in RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification for amplifying nucleotide sequences encoded by endogenous human SMN1 and SMN2 genes. In other embodiments, these primers are used as probes in, e.g., hybridization assays, such as Southern blot or Northern blot.

In a specific embodiment, a pharmaceutical or assay kit comprises the forward primer with the nucleotide sequence found in SEQ ID NO. 1, in a container, and the reverse primer with the nucleotide sequence found in SEQ ID NO. 9, in another container. In certain embodiments, these primers are used in RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification for amplifying nucleotide sequences encoded by endogenous human SMN1 and SMN2 genes. In other embodiments, these primers are used as probes in, e.g., hybridization assays, such as Southern blot or Northern blot.

In a specific embodiment, a pharmaceutical or assay kit comprises the forward primer with the nucleotide sequence found in SEQ ID NO. 1, in a container, and the reverse primer with the nucleotide sequence found in SEQ ID NO. 12, in another container. In certain embodiments, these primers are used in RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR), PCR (e.g., qPCR) or rolling circle amplification for amplifying nucleotide sequences encoded by endogenous human SMN1 and SMN2 genes. In other embodiments, these primers are used as probes in, e.g., hybridization assays, such as Southern blot or Northern blot.

In another embodiment, a pharmaceutical or assay kit comprises an SMN probe described herein (e.g., SEQ ID NO. 3 or 10), in one container. In other embodiments, the probe is used in, e.g., a hybridization assay, such as a Southern blot or Northern blot. In a specific embodiment, the probe is used in RT-qPCR or qPCR. In certain embodiments, components needed for a PCR (e.g., qPCR), RT-PCR (e.g., endpoint RT-PCR and/or RT-qPCR) or rolling circle amplification, such as polymerase, deoxynucleoside triphosphates, primers, etc., are included in such kits. In some embodiments, components needed for hybridization are included in such kits.

In one embodiment, a pharmaceutical or assay kit comprises an SMN reverse primer (e.g., SEQ ID NO. 2, 9 or 12) in one container, an SMN forward primer (e.g., SEQ ID NO. 1, 7, 8, 11 or 13) in another container, and an SMN probe (e.g., SEQ ID NO. 3 or 10) in another container, and instructions for use. In another embodiment, a pharmaceutical or assay kit comprises one or more SMN reverse primers (e.g., SEQ ID NO. 2, 9 and/or 12) in one container, one or more SMN forward primers (e.g., SEQ ID NO. 1, 7, 8, 11 and/or 13) in another container, and one or more SMN probe (e.g., SEQ ID NO. 3 and/or 10) in another container, and instructions for use.

In certain embodiments, components needed to run a PCR, RT-PCR or rolling circle amplification, such as polymerase, deoxynucleoside triphosphates, etc., are included in such kits. A pharmaceutical or assay kit containing such probes and/or primers can be used in PCR and RT-PCR to, e.g.: (i) assess whether a therapeutic agent (e.g., a compound of Formula (I) or a form thereof) enhances inclusion of exon 7 of SMN1 and/or SMN2 into mRNA that is transcribed from the SMN1 and/or SMN2 gene, (ii) monitor the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and includes exon 7 and the amount of mRNA that is transcribed from the SMN1 and/or SMN2 gene and does not include exon 7 of SMN1 and/or SMN2, and/or (iii) monitor a subject's response to a therapeutic agent (e.g., a compound of Formula (I) or a form thereof). In other embodiments, the subject is a human subject. In other embodiments, the human subject is a human patient. In certain other embodiments, the human patient is a human SMA patient.

In another aspect, provided herein is a pharmaceutical kit comprising a compound of Formula (I) or a form thereof, in a container, and instructions for use of the compound or form thereof. In a specific embodiment, provided herein is a pharmaceutical kit comprising a pharmaceutical composition comprising a compound of Formula (I) or a form thereof and a pharmaceutically acceptable carrier, excipient or diluent, and instructions for use. In another specific embodiment, provided herein is a pharmaceutical kit comprising a pharmaceutical composition comprising an effective amount of a compound of Formula (I) or a form thereof and a pharmaceutically acceptable carrier, excipient or diluent, and instructions for use. In one embodiment, the instructions for use explain one, two or more of the following: the dose, route of administration, frequency of administration and side effects of administration of a compound of Formula (I) or a form thereof to a subject. In other embodiments, the subject is a human subject. In other embodiments, the human subject is a human patient. In certain other embodiments, the human patient is a human SMA patient.

General Synthetic Methods

As disclosed herein, general methods for preparing the compounds of Formula (I) or a form thereof as described herein are available via standard, well-known synthetic methodology. Many of the starting materials are commercially available or, when not available, may be prepared using techniques known to those skilled in the art. The synthetic schemes provided herein comprise multiple reaction steps, each of which is intended to stand on its own and may be carried out with or without any preceding or succeeding step(s). In other words, performance of each of the individual reaction steps of the synthetic schemes provided herein in isolation is contemplated.

Scheme A

Compounds of Formula (I) described herein, wherein R₁ is a monocyclic or bicyclic heterocyclyl ring system, R₂ is an optionally substituted monocyclic or bicyclic heterocyclic, aryl or heteroaryl ring system and R_(a) is hydrogen, are prepared as described in Scheme A below.

Substituted 6-hydroxypyridine Compound A1 (where X represents various reactive groups, which are used to provide a plurality of R₁ functional group substituents by reacting suitable starting materials with Compound A1 or subsequently with Compound A3, Compound A4 or Compound A6 using techniques known to a person of ordinary skill in the art) is reacted with a Compound A2 (wherein L₁ is a suitable nucleophilic leaving group and R₁ is a mono or bicyclic heterocyclic ring system containing at least one amine group, for example, N-Boc-piperazine or N-Boc-4-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-5,6-dihydropyridine) in a suitable solvent or solvent mixture (such as n-BuOH, DMSO, NMP and the like or mixtures thereof) with or without an optional palladium catalyst (such as PdCl₂dppf and the like) to provide a Compound A3.

Compound A3 is reacted with paraformaldehyde in the presence of MgCl₂ and the like, to provide a Compound A4. Compound A4 can condense with a R₂-α-substituted acetic acid ester Compound A5 (where L₂ represents a C₁₋₂ alkyl leaving group) in the presence of an acid or a weak base (such as a R₂ substituted ester or piperidine and the like), undergoing Knoevenagel condensation, to provide a Compound A6.

Acetic acid ester Compound A7 (such as t-butyl acetate and the like) with a base (such as LHMDS and the like) in a suitable solvent (such as THF and the like) is reacted with a Compound A8 (wherein L₃ represents a leaving group or counter-part for a coupling reaction, such as a reactive nucleophile) in the presence of an optional catalyst to provide Compound A5.

A substituted 4-chloro-3-oxobutanoate Compound A9 (where L₂ represents a C₁₋₂alkyl leaving group) is reacted with an optionally substituted monocyclic heterocyclyl or heteroaryl ring system Compound A10 (wherein the term “Het” refers to an amidine-like moiety such as, but not limited to, 2-aminopyridine, 2-aminopyrimidine, 4-aminopyrimidine, 2-aminopyrazine, 3-aminopyridazine, 2-aminothiazole, 4-aminothiazole and the like) to provide a Compound A11, which is then carried forward in place of Compound A5 for reaction with Compound A4.

Scheme B

Compounds of Formula (I) described herein, wherein R₂ is an optionally substituted monocyclic or bicyclic heterocyclic, aryl or heteroaryl ring system and R_(a) is hydrogen, are prepared as described in Scheme B below.

A nicotinic acid Compound B1 (where X represents various reactive groups, which may be used to provide a plurality of R₁ functional group substituents by reacting suitable starting materials with Compound B1 or subsequently with Compound B2, Compound B3 or Compound B4 using techniques known to a person of ordinary skill in the art) is reacted with a reagent (such as sodium methoxide in an embodiment where X is chloro) in a suitable solvent (such as methanol and the like) to provide a Compound B2 as a mixture of 2-X-6-methoxy and 2-methoxy-6-X regioisomers. Compound B2 is then reduced to the corresponding aldehyde by a reducing reagent (such as diborane and the like), followed by oxidation with a suitable oxidant (such as MnO₂ or Dess-Martin periodinane and the like) to provide a Compound B3 as a mixture of regioisomers. Compound B3 is demethylated with BBr₃ to provide a Compound B4 as a mixture of regioisomers. The 2-hydroxy-6-X Compound B4 regioisomer is isolated and carried forward in place of Compound A4 according to the procedure of Scheme A.

Scheme C

Compounds of Formula (I) described herein, wherein R₁ is a monocyclic or bicyclic heterocyclyl ring system, R₂ is an optionally substituted bicyclic heteroaryl ring system and R_(a) is hydrogen, are prepared as described in Scheme C below.

Compound A4 is condensed with acetoacetate in the presence of an acid or a weak base (such as acetic acid or piperidine and the like) in a suitable solvent (such as acetonitrile, ethanol and the like or mixtures thereof), undergoing Knoevenagel condensation, to provide a Compound C1. Compound C1 is then brominated with an appropriate brominating reagent (such as Br₂ or NBS and the like) to provide a Compound C2, which is reacted with Compound A10 to provide Compound C3.

Scheme D

Compounds of Formula (I) described herein, wherein R₁ is a monocyclic or bicyclic heterocyclyl ring system, R₂ is an optionally substituted monocyclic or bicyclic heterocyclic, aryl or heteroaryl ring system and R_(a) and R_(b) are hydrogen, are prepared as described in Scheme D below.

Substituted 4-hydroxypyridine Compound D1 (where X represents various reactive groups, which are used to provide a plurality of R₁ functional group substituents by reacting suitable starting materials with Compound D1 or subsequently with Compound D2, Compound D3 or Compound D4 using techniques known to a person of ordinary skill in the art) is reacted with Compound A2 in a suitable solvent with an optional palladium catalyst to provide a Compound D2. Compound D2 is reacted with paraformaldehyde using the procedure of Scheme A to provide a Compound D3. Compound D3 is reacted with Compound A5 using the procedure of Scheme A, undergoing Knoevenagel condensation, to provide a Compound D4.

Specific Synthetic Examples

To describe in more detail and assist in understanding, the following non-limiting examples are offered to more fully illustrate the scope of compounds described herein and are not to be construed as specifically limiting the scope thereof. Such variations of the compounds described herein that may be now known or later developed, which would be within the purview of one skilled in the art to ascertain, are considered to fall within the scope of the compounds as described herein and hereinafter claimed. These examples illustrate the preparation of certain compounds. Those of skill in the art will understand that the techniques described in these examples represent techniques, as described by those of ordinary skill in the art, that function well in synthetic practice, and as such constitute preferred modes for the practice thereof. However, it should be appreciated that those of skill in the art should, in light of the present disclosure, appreciate that many changes can be made in the specific methods that are disclosed and still obtain a like or similar result without departing from the spirit and scope of the present description.

Other than in the following examples of the embodied compounds, unless indicated to the contrary, all numbers expressing quantities of ingredients, reaction conditions, experimental data, and so forth used in the specification and claims are to be understood as being modified by the term “about”. Accordingly, all such numbers represent approximations that may vary depending upon the desired properties sought to be obtained by a reaction or as a result of variable experimental conditions. Therefore, within an expected range of experimental reproducibility, the term “about” in the context of the resulting data, refers to a range for data provided that may vary according to a standard deviation from the mean. As well, for experimental results provided, the resulting data may be rounded up or down to present data consistently, without loss of significant figures. At the very least, and not as an attempt to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter should be construed in light of the number of significant digits and rounding techniques used by those of skill in the art.

While the numerical ranges and parameters setting forth the broad scope of the present description are approximations, the numerical values set forth in the examples set forth below are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements.

COMPOUND EXAMPLES

As used above, and throughout the present description, the following abbreviations, unless otherwise indicated, shall be understood to have the following meanings:

Abbreviation Meaning Δ heating (chemistry) or deletion (biology) AcOH or HOAc acetic acid Ac₂O acetic anhydride Ar argon ACN acetonitrile BINAP 2,2′-bis(diphenylphosphino)-1,1′-binaphthalene B(OiPr)₃ triisopropyl borate Boc tert-butoxy-carbonyl Boc₂O di-tert-butyl dicarbonate BuOH n-butanol ° C. degrees Centigrade CDI 1,1-carbonyldiimidazole or N,N′- carbonyldiimidazole (CHO)_(n) or (HCHO)_(n) paraformaldehyde d/h/hr/hrs/min/s day(d)/hour(h, hr or hrs)/minute(min)/ second(s) DavePhos 2-dicyclohexylphosphino-2′-(N,N- dimethylamino)biphenyl DCE 1,2-dichloroethane DCM dichloromethane (CH₂Cl₂) DIAD diisopropyl azodicarboxylate DIEA or DIPEA N,N-diisopropylethylamine DMA dimethylacetamide DMAP 4-(dimethylamino)pyridine DME 1,2-dimethoxyethane DMF dimethylformamide DMSO dimethylsulfoxide EDC or EDCI N-(3-dimethylaminopropyl)-N′- ethylcarbodiimide hydrochloride EtOAc ethyl acetate EtOH ethanol Et₂O diethyl ether HCHO formaldehyde iPrI 2-iodopropane JohnPhos (2-biphenyl)-di-t-butylphosphine KOAc potassium acetate LAH lithium aluminum hydride LC/MS, LCMS or LC-MS liquid chromatographic mass spectroscopy LDA lithium diisopropylamide LiHMDS or LHMDS lithium bis(trimethylsilyl)amide MeOH methanol MeI iodomethane Me—THF 2-methyltetrahydrofuran Me₂Zn dimethylzinc MnO₂ manganese dioxide MS mass spectroscopy NaH sodium hydride NaHS sodium hydrosulfide NaHMDS sodium bis(trimethylsilyl)amide or sodium hexamethyldisilazide NaI sodium iodide NaOAc sodium acetate NaOMe sodium methoxide NBS N-bromosuccinimide NMP N-methylpyrrolidone NMR nuclear magnetic resonance o/n overnight Pd palladium Pd/C palladium on carbon Pd(dba)₂ bis(dibenzylideneacetone)palladium Pd₂(dba)₃ or Pd₂dba₃ tris(dibenzylideneacetone)dipalladium(0) PdCl₂(PhCN)₂ trans-bis(benzonitrile)dichloropalladium(II) PdCl₂(dppf), PdCl₂dppf or [1,1′-bis(diphenylphosphino)ferrocene] Pd(dppf)Cl₂ dichloropalladium(II) Pd(OAc)₂ palladium(II) acetate Pd(PPh₃)₄ or Pd(pph₃)₄ tetrakis(triphenylphosphine)palladium(0) Pd(PPh₃)₂Cl₂, PdCl₂(PPh₃)₂ bis(triphenylphosphine)palladium(II) or PdCl₂(Ph₃P)₂ dichloride PHBu₃BF₄ or tBu₃PHBF₄ tri-tert-butylphosphonium tetrafluoroborate PhI iodobenzene PhI(OTFA)₂ [bis(trifluoroacetoxy)iodo]benzene PhMe toluene POCl₃ phosphoryl chloride PPh₃ triphenylphosphine PPA polyphosphoric acid PPTs pyridinium p-toluenesulfonate psi pounds per square inch pressure PyBOP (benzotriazol-1-yloxy) tripyrrolidinophosphonium hexafluorophosphate rt room temperature S-Phos, SPhos or Sphos 2-dicyclohexylphosphino-2′,6′- dimethoxybiphenyl T₃P propylphosphonic anhydride TEA, Et₃N or NEt₃ triethylamine Tf₂O triflic anhydride TFA trifluoroacetic acid THF tetrahydrofuran TLC thin layer chromatography TMS trimethylsilane TMSCl trimethylchlorosilane or trimethylsilyl chloride TMSOK potassium trimethylsilanolate t-Bu tert-butyl TsOH, p-TsOH or pTSA tosylic acid or p-toluenesulfonic acid xantphos 4,5-bis(diphenylphosphino)-9,9- dimethylxanthene

Example 1 Preparation of Cpd 5 Part 1: Preparation of t-butyl 4-(5-formyl-6-hydroxypyridin-2-yl)piperazine-1-carboxylate

Step A: To 2-chloro-6-hydroxypyridine (12.3 g, 94 mmol) in n-BuOH (50 mL) was added t-butyl piperazine-1-carboxylate (46.0 g, 235 mmol). The mixture was heated at 140° C. for 3 days. The reaction mixture was extracted with ethyl acetate (1.5 L) and washed with saturated NH₄Cl solution and then brine. The organic layer was separated, dried over MgSO₄, and concentrated under reduced pressure. The resulting solid was dissolved by CH₃CN (100 mL) and precipitated by adding water (1 L). The precipitate was filtered, washed with water and ether. The organic layer of the filtrate was separated and concentrated under reduced pressure. The residue was purified by column chromatography (50%-100% EtOAc/hexanes). A total of 18.7 g (71%) of t-butyl 4-(6-hydroxypyridin-2-yl)piperazine-1-carboxylate was obtained as a white solid. MS m/z 280.2 [M+H]⁺; ¹H NMR (500 MHz, CDCl₃) δ (ppm) 7.40 (1H, m), 6.04 (1H, d, J=8.8 Hz), 5.64 (1H, d, J=7.2 Hz), 3.62 (4H, m), 3.36 (4H, m), 1.51 (9H, s).

Step B: To a mixture of t-butyl 4-(6-hydroxypyridin-2-yl)piperazine-1-carboxylate (8.4 g, 30 mmol) and MgCl₂ (5.8 g, 60 mmol) in CH₃CN (100 mL) was added triethylamine (25.2 mL, 150 mmol). After the mixture was stirred for 10 minutes at ambient temperature, paraformaldehyde (9.0 g, 300 mmol) was added to the mixture. The mixture was stirred for 18 hours at 60° C., and then cooled to room temperature. The mixture was then diluted with EtOAc (500 mL) and washed with 1 M Rochelle salt solution (200 mL) and saturated NH₄Cl solution (200 mL). The organic layer was concentrated under reduced pressure and purified by column chromatography (30%-50% EtOAc/hexanes) to yield 3.6 g (39%) of t-butyl 4-(5-formyl-6-hydroxypyridin-2-yl)piperazine-1-carboxylate as white solid. MS m/z 308.2 [M+H]⁺; ¹H NMR (500 MHz, CDCl₃) δ (ppm) 12.35 (1H, br), 9.55 (1H, s), 7.66 (1H, d, J=8.51 Hz), 6.26 (1H, d, J=8.83 Hz), 3.79 (4H, m), 3.56 (4H, m), 1.51 (9H, s).

Part 2: Preparation of t-butyl 2-(4-chlorobenzo[d]thiazol-2-yl)acetate

A 1-Liter, 3-necked round bottomed flask fitted with a nitrogen inlet, a 500 mL addition funnel and a septum stopper was charged with t-butyl acetate (26.8 mL, 200 mmol) and anhydrous THF (50 mL). Upon cooling in a dry ice-acetone bath, to the mixture was added lithium bis(trimethylsilyl)amide (1M, THF solution) (200 mL, 200 mmol) via syringe over 15 min. After stirring at that temperature for 30 minutes, to the mixture was added a solution of 2,4-dichloro-benzothiazole (8.15 g, 40 mmol) in THF (100 mL) from the addition funnel over 15 minutes. The cooling bath was removed allowing the reaction to warm to room temperature over 1 hour. The reaction mixture was concentrated, then diluted with EtOAc and a saturated NaHCO₃ solution. The organic layer was separated and the aqueous layer was extracted with EtOAc twice. The combined organic layer was dried over anhydrous sodium sulfate, filtered, concentrated and purified by column chromatography on silica gel eluting with a gradient mixture of EtOAc/hexanes to give 11.28 g (99%) of the title compound as a yellow solid. ¹H-NMR (500 MHz, DMSO-d₆) δ (ppm) 8.00 (1H, dd, J=1.0, 8.0 Hz), 7.53 (1H, dd, J=1.0, 8.0 Hz), 7.36 (1H, t, J=8.0 Hz), 4.19 (2H, s), 1.38 (9H, s).

Part 3: 3-(4-chlorobenzo[d]thiazol-2-yl)-7-(4-methylpiperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one

Step A: To a mixture of t-butyl 4-(5-formyl-6-hydroxypyridin-2-yl)piperazine-1-carboxylate (614 mg, 2.0 mmol) and t-butyl 2-(4-chlorobenzo[d]thiazol-2-yl)acetate (624 mg, 2.2 mmol) in EtOH (15 mL) were added piperidine (0.6 mL, 6.0 mmol) and acetic acid (0.25 mL, 3.0 mmol). The reaction mixture was heated to 90° C. for 6 hours, and cooled to room temperature. To the mixture was added water (30 mL) to give a precipitate. The precipitate was filtered and washed with water and then ether. After drying under a flow of nitrogen, 850 mg (85%) of t-butyl 4-(3-(4-chlorobenzo[c]thiazol-2-yl)-2-oxo-2H-pyrano[2,3-b]pyridin-7-yl)piperazine-1-carboxylate was obtained as a yellow solid. MS m/z 499.3 [M+H]⁺; ¹H NMR (500 MHz, CDCl₃) δ (ppm) 9.04 (1H, s), 7.87 (1H, d, J=6.9 Hz), 7.85 (1H, d, J=8.8 Hz), 7.54 (1H, m), 7.33 (1H, t, J=7.9 Hz), 6.69 (1H, d, J=8.8 Hz), 3.83 (4H, m), 3.62 (4H, m), 1.52 (9H, s).

Step B: To a suspension of t-butyl 4-(3-(4-chlorobenzo[d]thiazol-2-yl)-2-oxo-2H-pyrano[2,3-b]pyridin-7-yl)piperazine-1-carboxylate (850 mg, 1.7 mmol) in CH₂Cl₂ (15 mL) was added 4N HCl in dioxane (5 mL). The mixture was stirred for 16 hours, and filtered. The solid was washed with ether and dried under nitrogen. 3-(4-Chlorobenzo[d]thiazol-2-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one hydrochloride was obtained quantitatively and used for the next step without further purification. MS m/z 399.1 [M+H]⁺; ¹H NMR (500 MHz, DMSO-d₆) δ (ppm) 9.12 (1H, s), 9.11 (2H, br), 8.36 (1H, d, J=8.8 Hz), 8.16, (1H, d, J=6.9 Hz), 7.66 (1H, d, J=8.8 Hz), 7.45 (1H, t, J=7.9 Hz), 7.14 (1H, d, J=8.8 Hz), 4.03 (4H, m), 3.26 (4H, m).

Step C: To a suspension of 3-(4-chlorobenzo[d]thiazol-2-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one hydrochloride (890 mg, 2.0 mmol) m DMF (10 mL) were added 37% aqueous HCHO (0.4 mL, 3.4 mmol) and then NaBH(OAc)₃ (636 mg, 3.0 mmol). The reaction mixture was stirred for 30 min at ambient temperature. To the mixture were added water (10 mL) and a saturated NaHCO₃ solution (10 mL) to form a precipitate. The precipitate was filtered off, washed with water and dried under nitrogen, affording 680 mg (97%) of the title compound as a yellow solid. Melting point 258-260° C.; MS m/z 413.2 [M+H]⁺; ¹H NMR (500 MHz, DMSO-d₆) δ (ppm) 9.06 (1H, s), 8.25 (1H, d, J=8.8 Hz), 8.14 (1H, d, J=6.9 Hz), 7.64 (1H, m), 7.44 (1H, d, J=7.7 Hz), 7.08 (1H, d, J=9.1 Hz), 3.79 (4H, m), 2.44 (4H, m), 2.25 (3H, s).

Example 2 Preparation of Cpd 39

Step A: A 75 mL pressure vessel was charged with ethyl 4-chloro-3-oxo-butyrate (6.58 g, 40 mmol), 2-amino-4-methylpyridine (4.33 g, 40 mmol) and 200 proof EtOH (40 mL). After stirring at 100° C. in an oil bath overnight, the reaction mixture was concentrated under reduced pressure, then diluted with CH₂Cl₂ and a saturated NaHCO₃ solution. The organic layer was separated and the aqueous layer was extracted with CH₂Cl₂ twice. The combined organic layer was dried over anhydrous sodium sulfate, filtered, concentrated, and purified by column chromatography on silica gel. Elution with a gradient mixture of dichloromethane-methanol yielded the 3.23 g (37%) of the title product as dark brown oil. MS m/z 219.2 [M+H]⁺; ¹H NMR (500 MHz, DMSO-d₆) δ (ppm) 8.38 (1H, d, J=6.95 Hz), 7.73 (1H, s), 7.24 (1H, d, J=1.60 Hz), 6.71 (1H, dd, J=1.60, 6.95 Hz), 4.10 (2H, q, J=7.00 Hz), 3.74 (2H, s), 2.34 (3H, s), 1.20 (3H, t, J=7.00 Hz);

Step B: To a mixture of t-butyl 4-(5-formyl-6-hydroxypyridin-2-yl)piperazine-1-carboxylate (120 mg, 0.4 mmol) and ethyl 2-(7-methylimidazo[1,2-a]pyridin-2-yl)acetate (96 mg, 0.44 mmol) in EtOH (0.2 mL) were added piperidine (0.3 mL) and acetic acid (0.1 mL). The reaction mixture was heated to 120° C. for 15 hours, and cooled to room temperature. To the mixture was added water (6 mL) to give a precipitate. The precipitate was filtered and washed with water and then ether. After drying under nitrogen, 112 mg (60%) of t-butyl 4-(3-(7-methylimidazo[1,2-a]pyridin-2-yl)-2-oxo-2H-pyrano[2,3-b]pyridin-7-yl)piperazine-1-carboxylate was obtained as a yellow solid. MS m/z 462.4 [M+H]⁺.

Step C: To a suspension of t-butyl 4-(3-(7-methylimidazo[1,2-a]pyridin-2-yl)-2-oxo-2H-pyrano[2,3-b]pyridin-7-yl)piperazine-1-carboxylate (112 mg, 0.24 mmol) in CH₂Cl₂ (3 mL) was added 4N HCl in dioxane (1.5 mL). The mixture was stirred for 16 hours, and filtered. The solid was washed with ether and dried under nitrogen. 3-(7-methylimidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one hydrochloride was obtained quantitatively and used in the next step without further purification. MS m/z 362.3 [M+H]⁺.

Step D: To a suspension of 3-(7-methylimidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one hydrochloride (42 mg, 0.11 mmol) in DMF (1.5 mL) were added 37% aqueous formaldehyde (0.02 mL, 0.22 mmol) and then NaBH(OAc)₃ (52 mg, 0.22 mmol). The reaction mixture was stirred for 30 min at ambient temperature. The mixture was diluted with CH₂Cl₂ (30 mL) and washed with a saturated NaHCO₃ solution. The organic layer was concentrated under reduced pressure and purified by column chromatography (5%-10% MeOH/CH₂Cl₂) to yield 25 mg (60%) of the title compound as a yellow solid. Melting point 264-268° C.; MS m/z 376.3 [M+H]⁺; ¹H NMR (500 MHz, CDCl₃) δ (ppm) 8.55 (1H, s), 8.32 (1H, s), 7.92 (1H, d, J=6.94 Hz), 7.64 (1H, d, J=8.83 Hz), 7.26 (1H, s), 6.56 (2H, m), 3.74 (4H, m), 2.52 (4H, m), 2.33 (6H, s).

As shown in Table 1 below, additional compounds disclosed herein may be prepared according to Example 2 by substituting the appropriate starting materials, reagents and reaction conditions.

Example 3 Preparation of Cpd 11

Step A: To a solution of 2-chloro-4-hydroxypyridine (12.9 g, 100 mmol) in n-BuOH (50 mL) was added t-butyl piperazine-1-carboxylate (46.5 g, 250 mmol). The mixture was heated at 140° C. for 3 days and then diluted with EtOAc (2 L) at ambient temperature. The organic phase was washed with saturated NH₄Cl solution and then brine. The organic layer was separated, dried over MgSO₄, and concentrated under reduced pressure. The residue was purified by column chromatography (5%-20% MeOH/CH₂Cl₂) to give 12.2 g (44%) of t-butyl 4-(4-hydroxypyridin-2-yl)piperazine-1-carboxylate as a white solid. MS m/z 280.2 [M+H]⁺; ¹H NMR (500 MHz, CDCl₃) δ (ppm) 7.72 (1H, d, J=6.62 Hz), 6.20 (1H, dd, J=6.31, 2.21 Hz), 6.02 (1H, d, J=1.89 Hz), 3.56 (4H, m), 3.42 (4H, m), 1.50 (9H, s).

Step B: To a mixture of t-butyl 4-(4-hydroxypyridin-2-yl)piperazine-1-carboxylate (5.03 g, 18.0 mmol) and MgCl₂ (3.42 g, 36 mmol) in CH₃CN (100 mL) was added triethylamine (15.1 mL, 90 mmol). After the mixture was stirred for 10 minutes at ambient temperature, paraformaldehyde (5.4 g, 180 mmol) was added to the mixture. The mixture was stirred for 18 hours at 60° C., and then cooled to room temperature. The mixture was then diluted with EtOAc (400 mL) and washed with 1 M Rochelle salt solution (200 mL) and saturated NH₄Cl solution (200 mL). The organic layer was concentrated under the reduced pressure and purified by column chromatography (30%-80% EtOAc/hexanes) to yield 1.5 g (27%) of t-butyl 4-(5-formyl-4-hydroxypyridin-2-yl)piperazine-1-carboxylate as white solid. MS m/z 308.2 [M+H]⁺; ¹H NMR (500 MHz, CDCl₃) δ (ppm) 11.37 (1H, s), 9.64 (1H, s), 8.27 (1H, s), 5.98 (1H, s), 3.71 (4H, m), 3.56 (4H, m), 1.48 (9H, s).

Step C: To a mixture of t-butyl 4-(5-formyl-4-hydroxypyridin-2-yl)piperazine-1-carboxylate (61 mg, 0.2 mmol) and t-butyl 2-(4-chlorobenzo[d]thiazol-2-yl)acetate (62 mg, 0.22 mmol) in EtOH (2 mL) were added piperidine (0.06 mL, 0.6 mmol) and acetic acid (0.025 mL, 0.3 mmol). The reaction mixture was heated to 60° C. for 6 hours, and cooled to room temperature. To the mixture was added water (6 mL) to give a precipitate. The precipitate was filtered and washed with water and then ether. After drying under nitrogen, 96 mg (96%) of t-butyl 4-(3-(4-chlorobenzo[c]thiazol-2-yl)-2-oxo-2H-pyrano[3,2-c]pyridin-7-yl)piperazine-1-carboxylate was obtained as a yellow solid. MS m/z 499.3 [M+H]⁺; ¹H NMR (500 MHz, CDCl₃) δ (ppm) 9.08 (1H, s), 8.62 (1H, s), 7.86 (1H, d, J=9.14 Hz), 7.55 (1H, m), 7.34 (1H, t, J=7.88 Hz), 6.48 (1H, s), 3.80 (4H, m), 3.62 (4H, m), 1.51 (9H, s).

Step D: To a suspension of t-butyl 4-(3-(4-chlorobenzo[d]thiazol-2-yl)-2-oxo-2H-pyrano[3,2-c]pyridin-7-yl)piperazine-1-carboxylate (96 mg, 0.19 mmol) in CH₂Cl₂ (2 mL) was added 4N HCl in dioxane (1 mL). The mixture was stirred for 6 hours, and filtered. The solid was washed with ether and dried under nitrogen to give 61 mg (82%) of 3-(4-chlorobenzo[d]thiazol-2-yl)-7-(piperazin-1-yl)-2H-pyrano[3,2-c]pyridin-2-one hydrochloride used in the next step without further purification. MS m/z 399.1 [M+H]⁺; ¹H NMR (500 MHz, DMSO-d₆) δ (ppm) 9.34 (2H, br), 9.13 (1H, s), 8.96 (1H, s), 8.16 (1H, d, J=6.94 Hz), 7.66 (1H, d, J=6.62 Hz), 7.46 (1H, t, J=7.88 Hz), 7.00 (1H, s), 4.01 (4H, m), 3.22 (4H, m).

Step E: To a suspension of 40 mg (0.1 mmol) of 3-(4-chlorobenzo[d]thiazol-2-yl)-7-(piperazin-1-yl)-2H-pyrano[3,2-c]pyridin-2-one hydrochloride in dichloroethane (1 mL) were added 37% aqueous formaldehyde (0.01 mL, 0.2 mmol) and then NaBH(OAc)₃ (40 mg, 0.2 mmol). The reaction mixture was stirred for 30 min at ambient temperature. The solvent was evaporated and water was added (2 mL) to the mixture. The precipitate was filtered off, washed with water and dried under nitrogen to afford 34 mg (82%) of the title compound as a yellow solid. Melting point 285-288° C.; MS m/z 413.2 [M+H]⁺; ¹H NMR (500 MHz, DMSO-d₆) δ (ppm) 9.08 (1H, s), 8.89 (1H, s), 8.14 (1H, m), 7.66 (1H, m), 7.44 (1H, t, J=7.72 Hz), 6.89 (1H, s), 3.77 (4H, m), 2.42 (4H, m), 2.24 (3H, s).

Example 4 Preparation of Cpd 57

Step A: To a mixture of t-butyl 4-(5-formyl-4-hydroxypyridin-2-yl)piperazine-1-carboxylate (124 mg, 0.40 mmol) and ethyl 2-(7-methylimidazo[1,2-a]pyridin-2-yl)acetate (96 mg, 0.44 mmol) in EtOH (0.2 mL) were added piperidine (0.3 mL) and acetic acid (0.1 mL). The reaction mixture was heated to 120° C. for 15 hours and cooled to room temperature. To the mixture was added water (2 mL) to give a precipitate. The precipitate was filtered and washed with water and then ether. After drying under nitrogen, 115 mg (63%) of t-butyl 4-(3-(7-methylimidazo[1,2-a]pyridin-2-yl)-2-oxo-2H-pyrano[3,2-c]pyridin-7-yl)piperazine-1-carboxylate was obtained as a yellow solid. MS m/z 462.3 [M+H]⁺.

Step B: To a suspension of t-butyl 4-(3-(7-methylimidazo[1,2-a]pyridin-2-yl)-2-oxo-2H-pyrano[3,2-c]pyridin-7-yl)piperazine-1-carboxylate (115 mg, 0.25 mmol) in CH₂Cl₂ (2 mL) was added 4N HCl in dioxane (1 mL). The mixture was stirred for 2 hours, and then filtered. The solid was washed with ether and dried under nitrogen to give 3-(7-methylimidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[3,2-c]pyridin-2-one hydrochloride quantitatively which was used in the next step without further purification. MS m/z 362.2 [M+H]⁺.

Step C: To a suspension of 3-(7-methylimidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[3,2-c]pyridin-2-one hydrochloride (50 mg, 0.12 mmol) in DMF (10 mL) were added 37% aqueous formaldehyde (0.025 mL, 0.25 mmol) and then NaBH(OAc)₃ (55 mg, 0.25 mmol). The reaction mixture was stirred for 1 hour at ambient temperature. To the mixture were added water (2 mL) and a saturated NaHCO₃ solution (2 mL) to form make a precipitate. The precipitate was filtered off, washed with water and dried under nitrogen to give 30 mg (67%) of the title compound as a yellow solid. MS m/z 376.3 [M+H]⁺; ¹H NMR (500 MHz, DMSO-d₆) δ (ppm) 8.63 (1H, s), 8.59 (1H, s), 8.41 (1H, d, J=6.96 Hz), 8.32 (1H, s), 7.22 (1H, s), 6.71 (1H, s), 6.66 (1H, dd, J=6.94, 1.58 Hz), 3.60 (4H, m), 2.49 (3H, s), 2.28 (3H, s), 2.22 (4H, m).

As shown in Table 1 below, additional compounds disclosed herein may be prepared according to Example 4 by substituting the appropriate starting materials, reagents and reaction conditions.

Example 5 Preparation of Cpd 91 Part 1: Preparation of 6-chloro-2-hydroxynicotinaldehyde

Step A: 2,6-Dichloronicotinic acid (30 g, 156.3 mmol) was dissolved in methanol (300 mL) at room temperature. Sodium ethoxide (5.4 M in MeOH, 781.3 mmol, 145 mL) was added slowly at the same temperature. The reaction mixture was stirred at 70° C. for 5 hours and cooled to room temperature. The precipitated solid from reaction mixture was filtered off and the mother liquor was concentrated under vacuum. All solid collected was dissolved in water (300 mL) and the solution was acidified with 6N HCl solution to pH 6 at 0° C. The aqueous layer was extracted with ethyl acetate five times. The combined organic layers were dried over MgSO₄. The organic layer was filtered off and concentrated to give a 1:1 mixture of 6-chloro-2-methoxynicotinic acid and 2-chloro-6-methoxynicotinic acid (20.22 g, 69%). MS m/z 188 [M+H]⁺.

Step B: The mixture obtained above (11.48 g, 61.2 mmol) was dissolved in THF (50 mL) and cooled to 0° C. Borane-THF complex (1.0 M in THF, 200 mL) was added slowly at 0° C. The reaction mixture was stirred at room temperature for 1 hour and cooled back to 0° C. Aqueous 6N HCl (15 mL) was added very slowly at 0° C. The aqueous layer was neutralized with a saturated NaHCO₃ solution to pH 7. Dichloromethane was added and the aqueous layer was extracted. The combined organic layers were dried over K₂CO₃, filtered and concentrated under vacuum to yield 10.6 g of corresponding alcohols. The residue can be used directly in the oxidation step or purified on silica gel with the mixture of ethyl acetate and hexane. TLC R_(f) 0.31 (30% EtOAc in hexane). MS m/z 174 [M+H]⁺.

The isolated alcohols (3.9 g, 22.7 mmol) were dissolved in dichloromethane (110 mL) and cooled to 0° C. Dess-Martin Periodinane (11.6 g, 27.3 mmol) was added portionwise. The reaction mixture was stirred at 0° C. for 30 min. The reaction was quenched with a saturated NaHCO₃ solution and extracted with dichloromethane. The combined organic layers were dried over K₂CO₃, filtered and concentrated to give a mixture of 3.53 g of 6-chloro-2-methoxynicotinaldehyde and 2-chloro-6-methoxynicotinaldehyde (91%).

Step C: The mixture of 6-chloro-2-methoxynicotinaldehyde and 2-chloro-6-methoxynicotinaldehyde (3.3 g, 19.3 mmol) were dissolved in dichloromethane (100 mL) and cooled to −15° C. BBr₃ (1.0 M in CH₂Cl₂, 38.6 mmol) was added slowly at that temperature. The solution was stirred at 0° C. for 30 min and neutralized with a saturated NaHCO₃ solution to pH 7. The aqueous layer was washed with dichloromethane twice to remove 2-chloro-6-methoxyaldehyde. The aqueous layer was treated with brine and left for 3 hours. The precipitated solid was filtered and dried under vacuum to afford 1.07 g of 6-chloro-2-methoxyaldehyde (71%) as a white powder. TLC R_(f) 0.06 (70% CH₃CN in EtOAc). MS m/z 158 [M+H]⁺.

Part 2: Preparation of ethyl 2-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)acetate

A 75 mL pressure vessel was charged with ethyl 4-chloro-3-oxo-butyrate (4 g, 24.4 mmol), 3,5-dimethylpyrazin-2-amine (3 g, 24.4 mmol) and 200 proof ethanol (24 mL). After stirring at 100° C. in an oil bath for 16 hours, the reaction mixture was concentrated, diluted with dichloromethane and a saturated sodium bicarbonate solution. The organic layer was separated and the aqueous layer was extracted with dichloromethane twice. The combined organic layers were dried over anhydrous sodium sulfate, filtered, concentrated, and purified on silica gel. Elution with a gradient mixture of dichloromethane and methanol yielded ethyl 2-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)acetate as a light brown solid (5 g). MS m/z 234 [M+H]⁺.

Part 3: Preparation of Cpd 91

Step A: 6-Chloro-2-hydroxynicotinaldehyde (1 g, 6.37 mmol) was dissolved in DMSO (12 mL) at room temperature. The solution was treated with tert-butyl 1,4-diazepane-1-carboxylate (2.55 g, 12.74 mmol) at room temperature. The reaction mixture was stirred at 100° C. for 2 hours and cooled to room temperature. An aqueous saturated NaHCO₃ solution (50 mL) was added. The aqueous layer was extracted with CH₂Cl₂ three times. The combined organic layers were dried over K₂CO₃, filtered and concentrated under vacuum to give 2.1 g of tert-butyl 4-(5-formyl-6-hydroxypyridin-2-yl)-1,4-diazepane-1-carboxylate. The concentrated residue was used in next step without further purification. MS m/z 322 [M+H]⁺.

Step B: To a solution of tert-butyl 4-(5-formyl-6-hydroxypyridin-2-yl)-1,4-diazepane-1-carboxylate (225 mg, 0.7 mmol) in 3 mL of EtOH were treated with piperidine (119.2 mg, 1.4 mmol), acetic acid (252 mg, 4.2 mmol) and ethyl 2-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)acetate (196 mg, 0.84 mmol) at room temperature. The reaction mixture was stirred in microwave reactor at 150° C. for 2 hours. The mixture was concentrated, quenched with a saturated NaHCO₃ solution and extracted with dichloromethane three times. The combined organic layers were combined and concentrated. The residue was purified on silica gel to provide tert-butyl 4-(3-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)-2-oxo-2H-pyrano[2,3-b]pyridin-7-yl)-1,4-diazepane-1-carboxylate after concentration. MS m/z 491 [M+H]⁺.

Step C: The white solid obtained above was dissolved in 2 mL of dichloromethane and treated with 4M HCl in dioxane (2 mL) at room temperature. After stirring the solution at room temperature for 16 hours, all the solvent was evaporated. The residue was triturated with ether/dichloromethane/hexane to provide the HCl salt of 7-(1,4-diazepan-1-yl)-3-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one (164 mg, 55%). An analysis sample of the free base was prepared by redissolving the HCl salt in dichloromethane, treating the mixture with a saturated NaHCO₃ solution, followed by extraction and evaporation. MS m/z 391 [M+H]⁺; ¹H NMR (500 MHz, DMSO-d₆) δ 8.74 (1H, s), 8.51 (1H, s), 8.33 (1H, br. s), 8.08 (1H, d, J=8.8 Hz), 6.80 (1H, d, J=8.8 Hz), 3.9-3.7 (4H, br. m), 2.9 (2H, br. t), 2.74 (3H, s), 2.65 (2H, br. m), 2.38 (3H, s), 1.8 (2H, br. m).

Step D: The HCl salt of 7-(1,4-diazepan-1-yl)-3-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one (100 mg, 0.26 mmol) was dissolved in DMF (4 mL) at room temperature. The solution was treated with formaldehyde (37 wt. % in water, 2.56 mmol, 0.19 mL) and sodium triacetoxyborohydride (165 mg, 0.78 mmol) at room temperature. The reaction mixture was stirred at room temperature for 2 hours and concentrated under vacuum. The residue was loaded on silica gel column and purified with methanol (5-20%) in dichloromethane to give the title compound (66.9 mg, 64%). Melting point 243-245° C.; MS m/z 405.1 [M+H]⁺; ¹H NMR (DMSO-d₆, 500 MHz) δ 8.74 (1H, s), 8.51 (1H, s), 8.32 (1H, br. s), 8.09 (1H, d, J=8.8 Hz), 6.80 (1H, d, J=8.8 Hz), 3.9-3.7 (4H, br. m), 3.18 (2H, br. d), 2.74 (3H, s), 2.65 (2H, br. m), 2.38 (3H, s), 2.25 (3H, s), 1.8 (2H, br. m).

As shown in Table 1 below, additional compounds disclosed herein may be prepared according to Example 5 by substituting the appropriate starting materials, reagents and reaction conditions.

Example 6 Preparation of Cpd 71

Step A: 6-Chloro-2-hydroxynicotinaldehyde (1.06 g, 6.76 mmol) was dissolved in DMSO (20 mL) at room temperature. The solution was treated with cis-2,6-dimethylpiperazine (1.16 g, 10.18 mmol) at room temperature. The reaction mixture was stirred at 100° C. for 3 hours and cooled to room temperature to yield crude 6-(cis-3,5-dimethylpiperazin-1-yl)-2-hydroxynicotinaldehyde. MS m/z 236 [M+H]⁺.

Step B: The solution of 6-(cis-3,5-dimethylpiperazin-1-yl)-2-hydroxynicotinaldehyde in dichloromethane (30 mL) was treated with diisopropylethylamine (2.62 g, 20.3 mmol) and di-tert-butyl dicarbonate (2.95 g, 13.52 mmol) in three portions at room temperature. The mixture was stirred at 40° C. for 2 hours and cooled to room temperature. The reaction was quenched with water and extracted with dichloromethane three times. The combined organic layers were concentrated and the residue was purified on silica gel to give tert-butyl 4-(5-formyl-6-hydroxypyridin-2-yl)-cis-2,6-dimethylpiperazine-1-carboxylate (2.03 g, 89%). MS m/z 336 [M+H]⁺.

Step C: tert-Butyl 4-(3-(4-chlorobenzo[d]thiazol-2-yl)-2-oxo-2H-pyrano[2,3-b]pyridin-7-yl)-2,6-dimethylpiperazine-1-carboxylate was prepared by a similar procedure as described in Example 5, Part 3, Step B. MS m/z 529 [M+H]⁺.

Step D: 3-(4-Chlorobenzo[d]thiazol-2-yl)-7-cis-3,5-dimethylpiperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one was prepared by a similar procedure as described in Example 5, Part 3, Step C. MS m/z 429 [M+H]⁺; ¹H NMR (DMSO-d₆, 500 MHz) δ 9.08 (1H, s), 8.33 (1H, d, J=8.8 Hz), 8.13 (1H, d, J=7.8 Hz), 7.64 (1H, d, J=7.6 Hz), 7.43 (1H, t, J=7.8 Hz), 7.16 (1H, d, J=8.8 Hz), 4.70 (2H, br. t), 3.4-3.2 (2H, br. m), 3.0 (2H, br. t), 1.31 (3H, s), 1.30 (3H, s).

Step E: The title compound was prepared by a similar procedure as described in Example 5, Part 3, Step D. Melting point 286-288° C.; MS m/z 441.1 [M+H]⁺; ¹H NMR (DMSO-d₆, 500 MHz) δ 9.06 (1H, s), 8.24 (1H, d, J=9.0 Hz), 8.13 (1H, dd, J=1.0, 7.9 Hz), 7.64 (1H, d, J=1.0, 7.8 Hz), 7.43 (1H, t, J=7.8 Hz), 7.11 (1H, d, J=9.0 Hz), 4.4 (2H, br. m), 2.8 (2H, br. t), 2.22 (3H, s), 2.15 (2H, br. m), 1.12 (3H, s), 1.14 (3H, s).

As shown in Table 1 below, additional compounds disclosed herein may be prepared according to Example 6 by substituting the appropriate starting materials, reagents and reaction conditions.

Example 7 Preparation of Cpd 114

Step A: To a solution of tert-butyl 4-(5-formyl-6-hydroxypyridin-2-yl)-1,4-diazepane-1-carboxylate (600 mg, 1.87 mmol) in EtOH (4 mL) were treated with piperidine (239 mg, 2.8 mmol), acetic acid (511 mg, 9.35 mmol) and ethyl acetoacetate (487 mg, 3.74 mmol) at room temperature. The reaction mixture was stirred at 90° C. for 3 hours. The mixture was concentrated, quenched with a saturated NaHCO₃ solution and extracted with dichloromethane three times. The combined organic layers were combined, dried over K₂CO₃, filtered and concentrated. The residue was purified on silica gel with methanol (0-10%) in dichloromethane to provide tert-butyl 4-(3-acetyl-2-oxo-2H-pyrano[2,3-b]pyridin-7-yl)-1,4-diazepane-1-carboxylate (450 mg, 62%). MS m/z 388 [M+H]⁺.

Step B: tert-Butyl 4-(3-acetyl-2-oxo-2H-pyrano[2,3-b]pyridin-7-yl)-1,4-diazepane-1-carboxylate (350 mg, 0.903 mmol) in 10 mL of chloroform was treated with bromine (1M in CHCl₃, 0.9 mmol) at room temperature. The reaction mixture was stirred at room temperature for 16 hours. The precipitated solid was filtered and the mother liquor was concentrated. The residue was purified on silica gel to yield tert-butyl 4-(3-(2-bromoacetyl)-2-oxo-2H-pyrano[2,3-b]pyridin-7-yl)-1,4-diazepane-1-carboxylate (132.2 mg, 32%). MS m/z 489 [M+Na]⁺.

Step C: tert-Butyl 4-(3-(2-bromoacetyl)-2-oxo-2H-pyrano[2,3-b]pyridin-7-yl)-1,4-diazepane-1-carboxylate (132 mg, 0.28 mmol) in 5 mL of EtOH was treated with 2-aminothiazole (34.1 mg, 0.34 mmol) at room temperature. The solution was refluxed for 16 hours and concentrated under vacuum. The residue was purified on silica gel to provide tert-butyl 4-(3-(imidazo[2,1-b]thiazol-6-yl)-2-oxo-2H-pyrano[2,3-b]pyridin-7-yl)-1,4-diazepane-1-carboxylate (64.3 mg, 49%). MS m/z 468 [M+H]⁺.

Step D: The HCl salt of 7-(1,4-diazepan-1-yl)-3-(imidazo[2,1-b]thiazol-6-yl)-2H-pyrano[2,3-b]pyridin-2-one was prepared by a similar procedure as described in Example 5, Part 3, Step C. MS m/z 367 [M+H]⁺; ¹H NMR (DMSO-d₆, 500 MHz) δ 9.3 (1H, br. s), 8.61 (1H, s), 8.38 (1H, s), 8.07 (1H, d, J=8.8 Hz), 7.98 (1H, d, J=4.4 Hz), 7.30 (1H, d, J=4.4 Hz), 6.89 (1H, d, J=8.8 Hz), 4.29 (1H, br. m), 4.02 (2H, br. m), 3.80 (2H, br. m), 3.29 (2H, br. m), 3.17 (2H, br. m), 2.13 (2H, br. m).

Step E: 3—The title compound was prepared by a similar procedure as described in Example 5, Part 3, Step D. Melting point 224-226° C.; MS m/z 382 [M+H]⁺; ¹H NMR (DMSO-d₆, 500 MHz) δ 8.54 (1H, br. s), 8.30 (1H, s), 8.00 (1H, d, J=8.8 Hz), 7.95 (1H, d, J=4.4 Hz), 7.26 (1H, d, J=4.4 Hz), 6.80 (1H, d, J=8.8 Hz), 3.95-3.61 (4H, br. m), 2.89-2.60 (4H, br. m), 2.38 (3H, s), 1.99 (2H, br. m).

As shown in Table 1 below, additional compounds disclosed herein may be prepared according to Example 7 by substituting the appropriate starting materials, reagents and reaction conditions.

Table 1 provides isolated compounds of a free base form of a compound of Formula (I) that may be prepared according to the procedures of the indicated Example by substituting the appropriate starting materials, reagents and reaction conditions. The preparation of any salt, isotopologue, stereoisomer, racemate, enantiomer, diastereomer or tautomer from a free base form of a compound of Formula (I) is also contemplated and further included within the scope of the description herein. Where a free base form of the compound was not isolated from the salt form, a person of ordinary skill in the art could be expected to perform the required reactions to prepare and isolate the free base form of the compound.

The term “Cpd” represents Compound number, the term “Ex” represents “Example Number” (wherein * indicates that the corresponding Example for the Compound is provided above), the term “M.P.” represents “Melting Point (° C.),” the term “MS” represents “Mass Spectroscopy Peak(s) m/z [M+H]⁺, [M+2+H]⁺, [M−H]⁻ or [M+2−H]⁻,” the term “D” represents “Decomposition/Decomposed,” the term “DR” represents “Decomposition Range,” the term “S” represents “Softens,” the term “ND” indicates that the value was “Not Determined” and the term “NI” indicates that the compound was “Not Isolated.”

TABLE 1 Ex Cpd Name M.P. MS 2  1 3-(1,3-benzothiazol-2-yl)-7-(piperazin-1-yl)-2H-pyrano 258-260 365.3 [2,3-b]pyridin-2-one 2  2a 3-(4-chloro-1,3-benzothiazol-2-yl)-7-(piperazin-1-yl)-2H- NI NI pyrano[2,3-b]pyridin-2-one 2  3 3-(1,3-benzothiazol-2-yl)-7-(4-methylpiperazin-1-yl)-2H- 247-250 379.2 pyrano[2,3-b]pyridin-2-one 2  4 3-(1,3-benzothiazol-2-yl)-7-[4-(2-chloroethyl)piperazin-1- ND 427.2 yl]-2H-pyrano[2,3-b]pyridin-2-one 1*  5 3-(4-chloro-1,3-benzothiazol-2-yl)-7-(4-methylpiperazin-1- 258-260 413.2 yl)-2H-pyrano[2,3-b]pyridin-2-one 2  6 3-(4-chloro-1,3-benzothiazol-2-yl)-7-[4-(2-hydroxybenzyl) 262-266 505.2 piperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 4  7 tert-butyl 4-[3-(1,3-benzothiazol-2-yl)-2-oxo-2H-pyrano ND 465.3 [3,2-c]pyridin-7-yl]piperazine-1-carboxylate 4  8 tert-butyl 4-[3-(4-chloro-1,3-benzothiazol-2-yl)-2-oxo-2H- ND 499.3 pyrano[3,2-c]pyridin-7-yl]piperazine-1-carboxylate 4  9a 3-(4-chloro-1,3-benzothiazol-2-yl)-7-(piperazin-1-yl)-2H- NI NI pyrano[3,2-c]pyridin-2-one 2  10 3-(4-chloro-1,3-benzothiazol-2-yl)-7-[4-(2-hydroxyethyl) 258-262 443.2 piperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 3*  11 3-(4-chloro-1,3-benzothiazol-2-yl)-7-(4-methylpiperazin-1- 285-288 413.2 yl)-2H-pyrano[3,2-c]pyridin-2-one 2  12 3-(4-chloro-1,3-benzothiazol-2-yl)-7-(4-ethylpiperazin-1- 266-269 427.2 yl)-2H-pyrano[2,3-b]pyridin-2-one 2  13 3-(4-chloro-1,3-benzothiazol-2-yl)-7-(4-propylpiperazin-1- 251-254 441.3 yl)-2H-pyrano[2,3-b]pyridin-2-one 4  14 3-(1,3-benzothiazol-2-yl)-7-(4-methylpiperazin-1-yl)-2H- ND 379.2 pyrano[3,2-c]pyridin-2-one 2  15a 3-(4-methyl-1,3-thiazol-2-yl)-7-(piperazin-1-yl)-2H- NI NI pyrano[2,3-b]pyridin-2-one 2  16a 7-(piperazin-1-yl)-3-[4-(trifluoromethyl)-1,3-thiazol-2-yl]- NI NI 2H-pyrano[2,3-b]pyridin-2-one 2  17 3-(1,3-benzothiazol-2-yl)-7-(4-ethylpiperazin-1-yl)-2H- 254-257 393.3 pyrano[2,3-b]pyridin-2-one 2  18 3-(1,3-benzothiazol-2-yl)-7-(4-propylpiperazin-1-yl)-2H- 247-250 407.3 pyrano[2,3-b]pyridin-2-one 2  19 3-(1,3-benzothiazol-2-yl)-7-[4-(propan-2-yl)piperazin-1-yl]- 241-245 407.3 2H-pyrano[2,3-b]pyridin-2-one 2  20 7-(4-ethylpiperazin-1-yl)-3-(4-methyl-1,3-thiazol-2-yl)-2H- 228-232 357.2 pyrano[2,3-b]pyridin-2-one 2  21 3-(4-methyl-1,3-thiazol-2-yl)-7-(4-propylpiperazin-1-yl)- 210-214 371.2 2H-pyrano[2,3-b]pyridin-2-one 2  22 3-(4-chloro-1,3-benzothiazol-2-yl)-7-[4-(2,3- 216-220 473.3 dihydroxypropyl)piperazin-1-yl]-2H-pyrano[2,3-b] pyridin-2-one 2  23 3-(4-chloro-1,3-benzothiazol-2-yl)-7-[4-(propan-2-yl) 230-234 441.3 piperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 2  24a 3-(6-methylimidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)- NI NI 2H-pyrano[2,3-b]pyridin-2-one 2  25 3-(1,3-benzothiazol-2-yl)-7-[4-(2-hydroxyethyl)piperazin- 220-224 409.3 1-yl]-2H-pyrano[2,3-b]pyridin-2-one 2  26 3-(1,3-benzothiazol-2-yl)-7-[4-(2,3-dihydroxypropyl) 236-239 439.3 piperazin-1-yl]-2H-pyran [2,3-b]pyridin-2-one 2  27 3-(6-methylimidazo[1,2-a]pyridin-2-yl)-7-(4- 260-264 376.3 methylpiperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 2  28a 3-(imidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H- NI NI pyrano[2,3-b]pyridin-2-one 2  29a 3-(7-methylimidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)- NI NI 2H-pyrano[2,3-b]pyridin-2-one 5  30a 7-(1,4-diazepan-1-yl)-3-(imidazo[1,2-a]pyrimidin-2-yl)- NI NI 2H-pyrano[2,3-b]pyridin-2-one 5  31a 3-(4-chloro-1,3-benzothiazol-2-yl)-7-(1,4-diazepan-1-yl)- NI NI 2H-pyrano[2,3-b]pyridin-2-one 7  32a 7-(1,4-diazepan-1-yl)-3-(imidazo[2,1-b][1,3]thiazol-6-yl)- NI NI 2H-pyrano[2,3-b]pyridin-2-one 4  33 3-(6-methylimidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)- ND 362.4 2H-pyrano[3,2-c]pyridin-2-one 4  34 3-(6-methylimidazo[1,2-a]pyridin-2-yl)-7-(4- 264-268 376.2 methylpiperazin-1-yl)-2H-pyrano[3,2-c]pyridin-2-one 4  35a 3-(8-chloro-6-methylimidazo[1,2-a]pyridin-2-yl)-7- NI NI (piperazin-1-yl)-2H-pyrano[3,2-c]pyridin-2-one 5  36 3-(imidazo[1,2-a]pyrimidin-2-yl)-7-(4-methyl-1,4- 232-234 377.3 diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 5  37 3-(4-chloro-1,3-benzothiazol-2-yl)-7-(4-methyl-1,4- 263-265 427.1 diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 2  38 3-(imidazo[1,2-a]pyridin-2-yl)-7-(4-methylpiperazin-1-yl)- 243-246 362.2 2H-pyrano[2,3-b]pyridin-2-one 2*  39 3-(7-methylimidazo[1,2-a]pyridin-2-yl)-7-(4- 264-268 376.3 methylpiperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 4  40a 3-(7-methylimidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)- NI NI 2H-pyrano[3,2-c]pyridin-2-one 4  41a 3-(2-methylimidazo[2,1-b][1,3]thiazol-6-yl)-7-(piperazin-1- NI NI yl)-2H-pyrano[3,2-c]pyridin-2-one 4  42a 3-(imidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H- NI NI pyrano[3,2-c]pyridin-2-one 2  43a 3-(5-methylpyrazolo[1,5-a]pyridin-2-yl)-7-(piperazin-1-yl)- NI NI 2H-pyrano[2,3-b]pyridin-2-one 2  44a 3-(imidazo[2,1-b][1,3]thiazol-6-yl)-7-(piperazin-1-yl)-2H- NI NI pyrano[2,3-b]pyridin-2-one 5  45a 7-(1,4-diazepan-1-yl)-3-(imidazo[1,2-a]pyridin-2-yl)-2H- NI NI pyrano[2,3-b]pyridin-2-one 5  46a 7-(1,4-diazepan-1-yl)-3-(8-fluoroimidazo[1,2-a]pyridin-2- NI NI yl)-2H-pyrano[2,3-b]pyridin-2-one 5  47a 3-(8-chloroimidazo[1,2-a]pyridin-2-yl)-7-(1,4-diazepan-1- NI NI yl)-2H-pyrano[2,3-b]pyridin-2-one 5  48 3-(imidazo[1,2-a]pyridin-2-yl)-7-(4-methyl-1,4-diazepan-1- 271-274 376.2 yl)-2H-pyrano[2,3-b]pyridin-2-one 5  49 3-(8-fluoroimidazo[1,2-a]pyridin-2-yl)-7-(4-methyl-1,4- 269-272 394.8 diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 5  50 3-(8-chloroimidazo[1,2-a]pyridin-2-yl)-7-(4-methyl-1,4- 245-246 410.3 diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 5  51a 3-(1,3-benzothiazol-2-yl)-7-(1,4-diazepan-1-yl)-2H-pyrano NI NI [2,3-b]pyridin-2-one 5  52a 3-(1,3-benzoxazol-2-yl)-7-(1,4-diazepan-1-yl)-2H-pyrano NI NI [2,3-b]pyridin-2-one 2  53 7-(4-methylpiperazin-1-yl)-3-(5-methylpyrazolo[1,5-a] 264-268 376.3 pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 2  54 3-(imidazo[2,1-b][1,3]thiazol-6-yl)-7-(4-methylpiperazin-1- 268-272 368 yl)-2H-pyrano[2,3-b]pyridin-2-one 4  55 3-(2-methylimidazo[2,1-b][1,3]thiazol-6-yl)-7-(4- 282-286 382.2 methylpiperazin-1-yl)-2H-pyrano[3,2-c]pyridin-2-one 5  56 3-(1,3-benzothiazol-2-yl)-7-(4-methyl-1,4-diazepan-1-yl)- 274-276 393.1 2H-pyrano[2,3-b]pyridin-2-one 4*  57 3-(7-methylimidazo[1,2-a]pyridin-2-yl)-7-(4- ND 376.3 methylpiperazin-1-yl)-2H-pyrano[3,2-c]pyridin-2-one 2  58 3-(7-methylimidazo[1,2-a]pyridin-2-yl)-7-[(3S)-3- ND 376.3 methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 2  59 3-(7-methylimidazo[1,2-a]pyridin-2-yl)-7-[(2S)-2- ND 376.3 methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 6  60 7-[(3R,5S)-3,5-dimethylpiperazin-1-yl]-3-(imidazo[1,2-a] 283-285 376.5 pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 2  61 7-[(3S)-3,4-dimethylpiperazin-1-yl]-3-(7-methylimidazo 246-250 390.3 [1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 2  62 7-[(2S)-2,4-dimethylpiperazin-1-yl]-3-(7-methylimidazo 242-246 390.3 [1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 2  63 3-(8-fluoroimidazo[1,2-a]pyridin-2-yl)-7-[(2S)-2- ND 380.8 methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 2  64 3-(8-fluoroimidazo[1,2-a]pyridin-2-yl)-7-[(3S)-3 - ND 380.8 methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 5  65 7-(1,4-diazepan-1-yl)-3-(7-methylimidazo[1,2-a]pyridin-2- 239-241 376.1 yl)-2H-pyrano[2,3-b]pyridin-2-one 5  66 7-(1,4-diazepan-1-yl)-3-(6-methylimidazo[1,2-a]pyridin-2- 240-243 376.1 yl)-2H-pyrano[2,3-b]pyridin-2-one 6  67 7-[(3R,5S)-3,5-dimethylpiperazin-1-yl]-3-(6-methylimidazo 248-251 390.1 [1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 2  68 7-[(2S)-2,4-dimethylpiperazin-1-yl]-3-(8-fluoroimidazo 210-213 394.2 [1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 2  69 7-[(3S)-3,4-dimethylpiperazin-1-yl]-3-(8-fluoroimidazo 222-225 394.2 [1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 6  70 3-(4-chloro-1,3-benzothiazol-2-yl)-7-[(3R,5S)-3,5- 295-297 427.1 dimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 6*  71 3-(4-chloro-1,3-benzothiazol-2-yl)-7-[(3R,5S)-3,4,5- 286-288 441.1 trimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 2  72 3-(6-methylimidazo[1,2-a]pyridin-2-yl)-7-[(3S)-3- ND 376.3 methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 2  73 3-(6-methylimidazo[1,2-a]pyridin-2-yl)-7-[(3R)-3- ND 376.3 methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 2  74 7-[(3S)-3,4-dimethylpiperazin-1-yl]-3-(6-methylimidazo 248-252 390.2 [1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 2  75 7-[(3R)-3,4-dimethylpiperazin-1-yl]-3-(6-methylimidazo 247-251 390.2 [1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 6  76 7-[(3R,5S)-3,5-dimethylpiperazin-1-yl]-3-(8-fluoroimidazo 247-249 394.5 [1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 6  77 3-(8-chloroimidazo[1,2-a]pyridin-2-yl)-7-[(3R,5S)-3,5- 240-242 410 dimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 6  78 7-[(3R,5S)-3,5-dimethylpiperazin-1-yl]-3-(imidazo[1,2-a] 255-258 377.5 pyrimidin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 2  79a 3-(imidazo[1,2-a]pyridin-2-yl)-7-[(3S)-3-methylpiperazin- NI NI 1-yl]-2H-pyrano[2,3-b]pyridin-2-one 2  80a 3-(imidazo[1,2-a]pyridin-2-yl)-7-[(3R)-3-methylpiperazin- NI NI 1-yl]-2H-pyrano[2,3-b]pyridin-2-one 2  81 7-[(3S)-3,4-dimethylpiperazin-1-yl]-3-(imidazo[1,2-a] 213-216 376.1 pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 2  82 7-[(3R)-3,4-dimethylpiperazin-1-yl]-3-(imidazo[1,2-a] 216-219 376.1 pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 2  83a 3-(imidazo[2,1-b][1,3](3S)-3-methylpiperazin-1-yl]- NI NI 2H-pyrano[2,3-b]pyridin-2-one 2  84a 3-(imidazo[2,1-b][1,3](3R)-3-methylpiperazin-1-yl]- NI NI 2H-pyrano[2,3-b]pyridin-2-one 6  85 3-(4-chloro-1,3-benzothiazol-2-yl)-7-[(2R,5S)-2,5- 223-227 427.1 dimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one (DR) 6  86 3-(4-chloro-1,3-benzothiazol-2-yl)-7-[(2R,5S)-2,4,5- 233-234 441.2 trimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one (DR) 5  87 7-[(2R,5S)-2,5-dimethylpiperazin-1-yl]-3-(6-methylimidazo 225-229 390.2 [1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 5  88 7-[(2R,5S)-2,5-dimethylpiperazin-1-yl]-3-(7-methylimidazo ND 390.2 [1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 5  89a 7-(1,4-diazepan-1-yl)-3-(6,8-dimethylimidazo[1,2- NI NI a]pyrazin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 6  90 3-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)-7-[(3R,5S)-3,5- 279-282 405.1 dimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 5*  91 3-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)-7-(4-methyl- 243-245 405.1 1,4-diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 5  92 7-[(2R,5S)-2,5-dimethylpiperazin-1-yl]-3-(8-fluoroimidazo 210-212 394.2 [1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 5  93 3-(6-methylimidazo[1,2-a]pyridin-2-yl)-7-[(2R,5S)-2,4,5- ND 404.2 trimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 5  94 3-(8-chloroimidazo[1,2-a]pyridin-2-yl)-7-[(2R,5S)-2,5- 172-175 410.2 dimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 5  95 3-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)-7-[(2R,5S)-2,5- 190-192 405.3 dimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 5  96 3-(7-methylimidazo[1,2-a]pyridin-2-yl)-7-[(2R,5S)-2,4,5- 114-117 404.3 trimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 5  97 3-(8-fluoroimidazo[1,2-a]pyridin-2-yl)-7-[(2R,5S)-2,4,5- 194-197 408.3 trimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 5  98 3-(8-chloroimidazo[1,2-a]pyridin-2-yl)-7-[(2R,5S)-2,4,5- 191-196 424.3 trimethylpiperazin-1-yl]-2H-pyrano [2,3-b]pyridin-2-one 6  99 7-[(3R,5S)-3,5-dimethylpiperazin-1-yl]-3-(7-methylimidazo 270-273 391.1 [1,2-a]pyrimidin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 6 100 7-[(3R,5S)-3,5-dimethylpiperazin-1-yl]-3-(7-methylimidazo 246-249 390.1 [1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 6 101 7-[(3R,5S)-3,5-dimethylpiperazin-1-yl]-3-(6-methylimidazo 279-281 391.1 [1,2-a]pyrazin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 5 102 7-[(2R,5S)-2,5-dimethylpiperazin-1-yl]-3-(6-methylimidazo ND 391.2 [1,2-a]pyrazin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 5 103 3-(6-methylimidazo[1,2-a]pyrazin-2-yl)-7-[(2R,5S)-2,4,5- 248-250 405.2 trimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 5 104a 7-(1,4-diazepan-1-yl)-3-(6-methylimidazo[1,2-a]pyrazin-2- NI NI yl)-2H-pyrano[2,3-b]pyridin-2-one 5 105 7-(4-methyl-1,4-diazepan-1-yl)-3-(6-methylimidazo[1,2-a] 290-293 391 pyrazin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 6 106 7-[(3R,5S)-3,5-dimethylpiperazin-1-yl]-3-(8-fluoro-6- 280-283 408 methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b] pyridin-2-one 5 107a 7-(1,4-diazepan-1-yl)-3-(8-fluoro-6-methylimidazo[1,2-a] NI NI pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 2 108 3-(8-fluoroimidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)- 231-235 366.1 2H-pyrano[2,3-b]pyridin-2-one 2 109 3-(8-chloroimidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)- 233-237 382.1 2H-pyrano[2,3-b]pyridin-2-one 2 110 3-(8-fluoroimidazo[1,2-a]pyridin-2-yl)-7-(4- 258-262 380.2 methylpiperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 2 111 3-(8-chloroimidazo[1,2-a]pyridin-2-yl)-7-(4- 256-259 396.1 methylpiperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 2 112a 3-(imidazo[1,2-a]pyrimidin-2-yl)-7-(piperazin-1-yl)-2H- NI NI pyrano[2,3-b]pyridin-2-one 5 113 3-(8-fluoro-6-methylimidazo[1,2-a]pyridin-2-yl)-7-(4- 269-273 408 methyl-1,4-diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 7* 114 3-(imidazo[2,1-b][1,3]thiazol-6-yl)-7-(4-methyl-1,4- 224-226 382 diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 5 115 7-(4-methyl-1,4-diazepan-1-yl)-3-(7-methylimidazo[1,2-a] 241-243 390 pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 5 116 7-(4-methyl-1,4-diazepan-1-yl)-3-(6-methylimidazo[1,2-a] 233-236 390.1 pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 2 117 3-(imidazo[1,2-a]pyrimidin-2-yl)-7-(4-methylpiperazin-1- 266-269 363.1 yl)-2H-pyrano[2,3-b]pyridin-2-one 6 118 3-(imidazo[1,2-a]pyrimidin-2-yl)-7-[(3R,5S)-3,4,5- 286-289 391.1 trimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 6 119 3-(8-fluoroimidazo[1,2-a]pyridin-2-yl)-7-[(3R,5 S)-3,4,5- 242-245 408.1 trimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 6 120 3-(8-chloroimidazo[1,2-a]pyridin-2-yl)-7-[(3R,5S)-3,4,5- 241-245 424 trimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 6 121 3-(imidazo[1,2-a]pyridin-2-yl)-7-[(3R,5S)-3,4,5- 242-246 390.1 trimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 5 122 7-[(2R,5S)-2,5-dimethylpiperazin-1-yl]-3-(8-fluoro-6- 195-198 408.5 methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b] pyridin-2-one 5 123 3-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)-7-[(2R,5S)- 234-236 419.6 2,4,5-trimethylpiperazin-1-yl]-2H-pyran[2,3-b]pyridin-2-one 5 124 7-[(1S,4S)-2,5-diazabicyclo[2.2.1]hept-2-yl]-3-(6- ND 374.2 methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b] pyridin-2-one 5 125 7-[(1S,4S)-5-methyl-2,5-diazabicyclo[2.2.1]hept-2-yl]-3- 211-213 388.2 (6-methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b] pyridin-2-one 5 126 7-(4-ethyl-1,4-diazepan-1-yl)-3-(imidazo[1,2-a]pyrimidin- 271-273 391.1 2-yl)-2H-pyrano[2,3-b]pyridin-2-one 5 127 7-(4-ethyl-1,4-diazepan-1-yl)-3-(imidazo[1,2-a]pyridin-2- 285-288 390.1 yl)-2H-pyrano[2,3-b]pyridin-2-one 5 128 3-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)-7-(4-ethyl-1,4- 289-291 419.1 diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 6 129 7-[(3R,5S)-4-ethyl-3,5-dimethylpiperazin-1-yl]-3- 281-284 404.1 (imidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 2 130 7-(4-ethylpiperazin-1-yl)-3-(6-methylimidazo[1,2-a] 235-237 390.1 pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 2 131 7-(4-ethylpiperazin-1-yl)-3-(7-methylimidazo[1,2-a] 258-261 390.1 pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 2 132 7-(4-ethylpiperazin-1-yl)-3-(8-fluoroimidazo[1,2-a]pyridin- 203-206 394 2-yl)-2H-pyrano[2,3-b]pyridin-2-one 2 133 3-(8-chloroimidazo[1,2-a]pyridin-2-yl)-7-(4-ethylpiperazin- 218-221 410 1-yl)-2H-pyrano[2,3-b]pyridin-2-one 2 134 7-(4-ethylpiperazin-1-yl)-3-(8-fluoro-6-methylimidazo[1,2- 238-242 408.1 a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 5 135 7-(1S,4S)-2,5-diazabicyclo[2.2.1]hept-2-yl]-3-(6,8- ND 389.5 dimethylimidazo[1,2-a]pyrazin-2-yl)-2H-pyrano[2,3-b] pyridin-2-one 5 136 7-[(1S,4S)-2,5-diazabicyclo[2.2.1]hept-2-yl]-3-(8-fluoro-6- ND 392.5 methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b] pyridin-2-one 5 137 7-[(3S)-4-ethyl-3-methylpiperazin-1-yl]-3-(8-fluoro-6- 239-243 422.5 methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b] pyridin-2-one 5 138 7-(4-ethyl-1,4-diazepan-1-yl)-3-(8-fluoro-6-methylimidazo 195-200 422.5 [1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 5 139 7-(4-ethyl-1,4-diazepan-1-yl)-3-(8-fluoroimidazo[1,2-a] 189-191 408.5 pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 2 140 3-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)-7-(4- 238-241 405.1 ethylpiperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 5 141 3-(8-chloroimidazo[1,2-a]pyridin-2-yl)-7-(4-ethyl-1,4- 201-204 424.5 diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 5 142 7-(4-ethyl-1,4-diazepan-1-yl)-3-(6-methylimidazo[1,2-a] 217-221 405.5 pyrazin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 5 143 7-[(3S)-4-ethyl-3-methylpiperazin-1-yl]-3-(6methylimidazo- 252-256 405.1 [1,2-a]pyrazin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 5 144 3-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)-7-[(3S)-4- 184-190 419.1 ethyl-3-methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one (DR) 5 145 3-(8-chloroimidazo[1,2-a]pyridin-2-yl)-7-[(3S)-4-ethyl-3- 196-199 424 methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 5 146 3-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)-7-[(3S)-3- ND 391.7 methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one

-   -   or a salt, isotopologue, stereoisomer, racemate, enantiomer,         diastereomer or tautomer thereof.

Table 2 further provides certain isolated compounds of a salt form of a compound of Formula (I) that may be prepared according to the procedures of the indicated Example by using the appropriate reactants, reagents and reaction conditions. The preparation of any free base, isotopologue, stereoisomer, racemate, enantiomer, diastereomer or tautomer from a salt form of a compound of Formula (I) is also contemplated and further included within the scope of the description herein. Where a free base form of the compound was not isolated from the salt form, a person of ordinary skill in the art could be expected to perform the required reactions to prepare and isolate the free base form of the compound.

The term “Cpd” represents Compound number, the term “Ex” represents “Example Number” (wherein * indicates that the corresponding Example for the Compound is provided above), the term “M.P.” represents “Melting Point (° C.),” the term “MS” represents “Mass Spectroscopy Peak(s) m/z [M+H]⁺, [M+2+H]⁺, [M−H]⁻ or [M+2−H]⁻,” the term “D” represents “Decomposition/Decomposed,” the term “DR” represents “Decomposition Range,” the term “S” represents “Softens” and the term “ND” indicates that the value was “Not Determined.”

TABLE 2 Ex Cpd Name M.P. MS 2 2 3-(4-chloro-1,3-benzothiazol-2-yl)-7-(piperazin-1-yl)-2H-pyrano ND 399.3 [2,3-b]pyridin-2-one hydrochloride 4 9 3-(4-chloro-1,3-benzothiazol-2-yl)-7-(piperazin-1-yl)-2H-pyrano 266-270 399.2 [3,2-c]pyridin-2-one hydrochloride 2 15 3-(4-methyl-1,3-thiazol-2-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b] 238-242 329.2 pyridin-2-one hydrochloride 2 16 7-(piperazin-1-yl)-3-[4-(trifluoromethyl)-1,3-thiazol-2-yl]-2H-pyrano 274-280 383.2 [2,3-b]pyridin-2-one hydrochloride 2 24 3-(6-methylimidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano 218-222 362.3 [2,3-b]pyridin-2-one hydrochloride 2 28 3-(imidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b] ND 348.2 pyridin-2-one hydrochloride 2 29 3-(7-methylimidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano 240-244 362.2 [2,3-b]pyridin-2-one hydrochloride 5 30 7-(1,4-diazepan-1-yl)-3-(imidazo[1,2-a]pyrimidin-2-yl)-2H-pyrano 250-252 363.3 [2,3-b]pyridin-2-one hydrochloride 5 31 3-(4-chloro-1,3-benzothiazol-2-yl)-7-(1,4-diazepan-1-yl)-2H-pyrano 271-273 413.2 [2,3-b]pyridin-2-one hydrochloride 7 32 7-(1,4-diazepan-1-yl)-3-(imidazo[2,1-b][1,3]thiazol-6-yl)-2H-pyrano 267-269 368.2 [2,3-b]pyridin-2-one hydrochloride 4 35 3-(8-chloro-6-methylimidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)- ND 396.3 2H-pyrano[3,2-c]pyridin-2-one hydrochloride 4 40 3-(7-methylimidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano ND 362.2 [3,2-c]pyridin-2-one hydrochloride 4 41 3-(2-methylimidazo[2,1-b][1,3]thiazol-6-yl)-7-(piperazin-1-yl)-2H- ND 368.2 pyrano[3,2-c]pyridin-2-one hydrochloride 4 42 3-(imidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[3,2-c] 278-284 348.3 pyridin-2-one hydrochloride 2 43 3-(5-methylpyrazolo[1,5-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano ND 362.2 [2,3-b]pyridin-2-one hydrochloride 2 44 3-(imidazo[2,1-b][1,3]thiazol-6-yl)-7-(piperazin-1-yl)-2H-pyrano ND 354.2 [2,3-b]pyridin-2-one hydrochloride 5 45 7-(1,4-diazepan-1-yl)-3-(imidazo[1,2-a]pyridin-2-yl)-2H-pyrano 265-267 362.4 [2,3-b]pyridin-2-one hydrochloride 5 46 7-(1,4-diazepan-1-yl)-3-(8-fluoroimidazo[1,2-a]pyridin-2-yl)-2H- 267-269 380.1 pyrano[2,3-b]pyridin-2-one hydrochloride 5 47 3-(8-chloroimidazo[1,2-a]pyridin-2-yl)-7-(1,4-diazepan-1-yl)-2H- 252-255 396.1 pyrano[2,3-b]pyridin-2-one hydrochloride 5 51 3-(1,3-benzothiazol-2-yl)-7-(1,4-diazepan-1-yl)-2H-pyrano[2,3-b] 284-286 379.2 pyridin-2-one hydrochloride 5 52 3-(1,3-benzoxazol-2-yl)-7-(1,4-diazepan-1-yl)-2H-pyrano[2,3-b] 243-245 363.2 pyridin-2-one hydrochloride 2 79 3-(imidazo[1,2-a]pyridin-2-yl)-7-[(3S)-3-methylpiperazin-1-yl]-2H- ND 362 pyrano[2,3-b]pyridin-2-one hydrochloride 2 80 3-(imidazo[1,2-a]pyridin-2-yl)-7-[(3R)-3-methylpiperazin-1-yl]-2H- ND 362 pyrano[2,3-b]pyridin-2-one hydrochloride 2 83 3-(imidazo[2,1-b][1,3]thiazol-6-yl)-7-[(3S)-3-methylpiperazin-1-yl]- ND 368.1 2H-pyrano[2,3-b]pyridin-2-one hydrochloride 2 84 3-(imidazo[2,1-b][1,3]thiazol-6-yl)-7-[(3R)-3-methylpiperazin-1-yl]- ND 368.1 2H-pyrano[2,3-b]pyridin-2-one hydrochloride 5 89 7-(1,4-diazepan-1-yl)-3-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)-2H- 273-276 391.2 pyrano[2,3-b]pyridin-2-one hydrochloride 5 104 7-(1,4-diazepan-1-yl)-3-(6-methylimidazo[1,2-a]pyrazin-2-yl)-2H- 267-269 377.1 pyrano[2,3-b]pyridin-2-one hydrochloride 5 107 7-(1,4-diazepan-1-yl)-3-(8-fluoro-6-methylimidazo[1,2-a]pyridin-2-yl)- 276-279 394.1 2H-pyrano[2,3-b]pyridin-2-one hydrochloride 2 112 3-(imidazo[1,2-a]pyrimidin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b] ND 349.2 pyridin-2-one hydrochloride

-   -   or an isotopologue, stereoisomer, racemate, enantiomer,         diastereomer or tautomer thereof.

BIOLOGICAL EXAMPLES

To describe in more detail and assist in understanding the present description, the following non-limiting biological examples are offered to more fully illustrate the scope of the description and are not to be construed as specifically limiting the scope thereof. Such variations of the present description that may be now known or later developed, which would be within the purview of one skilled in the art to ascertain, are considered to fall within the scope of the present description and as hereinafter claimed. These examples illustrate the testing of certain compounds described herein in vitro and/or in vivo and demonstrate the usefulness of the compounds for treating of SMA by enhancing the inclusion of exon 7 of SMN2 into mRNA transcribed from the SMN2 gene. Compounds of Formula (I) enhance inclusion of exon 7 of SMN2 into mRNA transcribed from the SMN2 gene and increase levels of Smn protein produced from the SMN2 gene, and thus can be used to treat SMA in a human subject in need thereof.

Example 1 SMN2 Minigene Construct Preparation of the Minigene Constructs

DNA corresponding to a region of the SMN2 gene starting from the 5′ end of exon 6 (ATAATTCCCCC) (SEQ ID NO. 14) and ending at nucleic acid residue 23 of exon 8 (CAGCAC) (SEQ ID NO. 15) was amplified by PCR using the following primers:

Forward primer: (SEQ ID NO. 16) 5′-CGCGGATCCATAATTCCCCCACCACCTC-3′, and Reverse primer: (SEQ ID NO: 17) 5′-CGCGGATCCGTGCTGCTCTATGCCAGCA-3′.

The 5′ end of each primer was designed to add a BamHI restriction endonuclease recognition site at both the 5′ end of exon 6 (GGATCC) (SEQ ID NO. 18) and the 3′ end after the 23^(rd) nucleotide of exon 8. Using the BamHI restriction endonuclease recognition sites, the PCR fragment was cloned into a derivative of the original pcDNA 3.1/Hygro vector which was modified as disclosed in United States Patent Publication US2005/0048549.

New UTRs were added to the modified vector using the HindIII site and the BamHI restriction sites comprising a 5′DEG UTR: 5′-TAGCTTCTTACCCGTACTCCACCGTTGGCAGCACGATCGCACGTCCCACGTGAAC CATTGGTAAACCCTG-3′ (SEQ ID NO. 19) cloned into the modified pcDNA3.1/Hygro vector together with a start codon upstream of the BamHI restriction site, and;

a 3′DEG UTR: 5′-ATCGAAAGTACAGGACTAGCCTTCCTAGCAACCGCGGGCTGGGAGTCTGAGACAT CACTCAAGATATATGCTCGGTAACGTATGCTCTAGCCATCTAACTATTCCCTATGTCT TATAGGG-3′ (SEQ ID NO. 20) cloned into the modified pcDNA3.1/Hygro vector using the NotI restriction endonuclease recognition site and the XhoI restriction endonuclease recognition site with a stop codon immediately downstream of the NotI restriction site. In addition, a firefly luciferase gene lacking the start codon was cloned into the vector using the BamHI and NotI restriction sites.

The resulting minigene comprises, in 5′ to 3′ order: the 5′-DEG UTR, the start codon, six additional nucleotides forming a BamHI restriction site, the nucleic acid residues of exon 6, the nucleic acid residues of intron 6 of SMN2, the nucleic acid residues of exon 7 of SMN2, the nucleic acid residues of intron 7 of SMN2, and the first 23 nucleic acid residues of exon 8 of SMN2, an additional six nucleotides forming a BamHI restriction site and the firefly luciferase gene lacking the start codon.

A single adenine residue was inserted after nucleotide 48 of exon 7 of SMN2 by site-directed mutagenesis. This minigene construct is referred to as SMN2-A.

SMN2 transcripts derived from minigenes containing exon 6 through 8 and the intervening introns recapitulate the splicing of their endogenous pre-mRNA (Lorson et al, Proc. Natl. Acad. Sci. U.S.A., 1999, 96 (11), 6307). An SMN2-alternative splicing reporter construct which contains exons 6 through 8 and the intervening introns followed by a luciferase reporter gene was generated. Salient features of this construct are the lack of the start codon in the luciferase gene, inactivation of the termination codon (in the open reading frame that encodes the SMN protein) of exon 7 by insertion of a nucleotide after nucleic acid 48 of exon 7 and addition of a start codon (ATG) immediately upstream of exon 6. A single adenine (SMN2-A) was inserted after nucleic residue 48 of exon 7.

The SMN2 minigene was designed such that the luciferase reporter is in frame with the ATG start codon immediately upstream of exon 6 when exon 7 is present in the mRNA and the luciferase reporter is out of frame with the ATG start codon immediately upstream of exon 6 if exon 7 of SMN2 is removed during splicing of the pre-mRNA. In addition, in the absence of exon 7, the open reading frame that starts from the ATG start codon immediately upstream of exon 6 contains a stop codon in the fragment of exon 8 of SMN. Thus, in the presence of compounds that increase the inclusion of exon 7 of SMN2 into mRNA transcribed from the SMN2 gene, more transcripts containing exon 7 and more functional reporter are produced. A schematic illustration of this description can be found in FIG. 1.

The DNA sequence of the minigene from the SMN2-A construct SEQ ID NO. 21 is provided in FIG. 2a . A picture of the minigene SMN2-A subsequences is shown in FIG. 2 b.

Example 2 SMN2 Minigene mRNA Splicing RT-qPCR Assay in Cultured Cells

The reverse transcription-quantitative PCR-based (RT-qPCR) assay is used to quantify the level of the full length SMN2 minigene mRNA containing SMN2 exon 7 in a HEK293H cell line stably transfected with said minigene and treated with a test compound.

Materials

Material Source HEK293H cells ATCC Catalog No. CRL-1573 Cells-To-Ct lysis buffer Life Technologies, Inc. (formerly Applied Biosystems) Catalog No.: 4399002 DMEM Life Technologies, Inc. (formerly Invitrogen) Catalog No.: 11960-044 96-well flat-bottom plates Becton Dickinson Catalog No.: 353072 RT-PCR Enzyme Mix Life Technologies, Inc. (formerly Applied Biosystems) Part No.: 4388520 (also included in AgPath-ID Kit Catalog No.: 4387391) RT-PCR buffer Life Technologies, Inc. (formerly Applied Biosystems) Part No.: 4388519 (also included in AgPath-ID Kit Catalog No.: 4387391) AgPath-ID One-Step RT- Life Technologies, Inc. (formerly Applied Biosystems) Catalog PCR Kit No.: 4387391 Thermocycler Life Technologies, Inc. (formerly Applied Biosystems) 7900HT

Protocol.

HEK293H cells stably transfected with the SMN2-A minigene construct described above (10,000 cells/well) are seeded in 200 μL of cell culture medium (DMEM plus 10% FBS, with 200 μg/mL hygromycin) in 96-well flat-bottom plates and the plate is immediately swirled to ensure proper dispersal of cells, forming an even monolayer of cells. Cells are allowed to attach for at least 4-6 hours. Test compounds are serially diluted 3.16-fold in 100% DMSO to generate a 7-point concentration curve. A solution of test compound (1 μL, 200× in DMSO) is added to each cell-containing well and the plate is incubated for 24 hours in a cell culture incubator (37° C., 5% CO₂, 100% relative humidity). Two replicates are prepared for each test compound concentration. The cells are then lysed in Cells-To-Ct lysis buffer and the lysate is stored at −80° C.

Full length SMN2-A minigene and GAPDH mRNA are quantified using the following primers and probes provided in Table 3. Primer SMN Forward A (SEQ ID NO. 1) hybridizes to a nucleotide sequence in exon 7 (nucleotide 22 to nucleotide 40), primer SMN Reverse A (SEQ ID NO. 2) hybridizes to a nucleotide sequence in the coding sequence of Firefly luciferase, SMN Probe A (SEQ ID NO. 3) hybridizes to a nucleotide sequence in exon 7 (nucleotide 50 to nucleotide 54) and exon 8 (nucleotide 1 to nucleotide 21). The combination of these three oligonucleotides detects only SMN1 or SMN2 minigenes (RT-qPCR) and will not detect endogenous SMN1 or SMN2 genes.

TABLE 3 Primers/Probes Sequence Source SMN Forward SEQ ID NO. 1: GAAGGAAGGTGCTCACATT PTC¹ Primer A SMN Reverse SEQ ID NO. 2: TCTTTATGTTTTTGGCGTCTTC PTC¹ Primer A SMN Forward SEQ ID NO. 3: 6FAM- PTC¹ Probe A AAGGAGAAATGCTGGCATAGAGCAGC-TAMRA hGAPDH Forward SEQ ID NO. 4: VIC-CGCCTGGTCACCAGGGCTGCT- LTI² Probe TAMRA hGAPDH Forward SEQ ID NO. 5: CAACGGATTTGGTCGTATTGG LTI² Primer hGAPDH Reverse SEQ ID NO. 6: TGATGGCAACAATATCCACTTTACC LTI² Primer ¹Primers and probe designed by PTC Therapeutics, Inc.; ²Commercially available from Life Technologies, Inc. (formerly Invitrogen).

The SMN forward and reverse primers are used at final concentrations of 0.4 μM. The SMN probe is used at a final concentration of 0.15 μM. The GAPDH primers are used at final concentrations of 0.2 μM and the probe at 0.15 μM.

The SMN2-minigene GAPDH mix (15 μL total volume) is prepared by combining 7.5 μL of 2×RT-PCR buffer, 0.4 μL of 25×RT-PCR enzyme mix, 0.75 μL of 20×GAPDH primer-probe mix, 4.0075 μL of water, 2 μL of 10-fold diluted cell lysate, 0.06 μL of 100 μM SMN forward primer, 0.06 μL of 100 μM SMN reverse primer, and 0.225 μL of 100 μM SMN probe.

PCR is carried out at the following temperatures for the indicated time: Step 1: 48° C. (15 min); Step 2: 95° C. (10 min); Step 3: 95° C. (15 sec); Step 4: 60° C. (1 min); then repeat Steps 3 and 4 for a total of 40 cycles.

Each reaction mixture contains both SMN2-A minigene and GAPDH primers/probe sets (multiplex design), allowing simultaneous measurement of the levels of two transcripts.

Two SMN spliced products are generated from the SMN2 minigene. The first spliced product containing exon 7, corresponding to SMN2 full length mRNA, is referred to herein using the term “SMN2 minigene FL.” The second spliced product lacking exon 7 is referred to herein using the term “SMN2 minigene Δ7.”

The increase of SMN2 minigene FL mRNA relative to that in cells treated with vehicle control is determined from real-time PCR data using a modified ΔΔCt method (as described in Livak and Schmittgen, Methods, 2001, 25:402-8). The amplification efficiency (E) is calculated from the slope of the amplification curve for SMN2 minigene FL and GAPDH individually. The abundances of SMN2 minigene FL and GAPDH are then calculated as (1+E)^(−Ct), where Ct is the threshold value for each amplicon. The abundance of SMN2 minigene FL is normalized to GAPDH abundance. The normalized SMN2 minigene FL abundance from test compound-treated samples is then divided by normalized SMN2 minigene FL abundance from vehicle-treated cells to determine the level of SMN2 FL mRNA relative to vehicle control.

Results.

As seen in FIG. 3, cells treated with Compound 5 (FIG. 3a ) and Compound 27 (FIG. 3b ) increased SMN2 minigene FL mRNA at low concentrations. The two test compounds fully restored exon 7 inclusion relative to untreated cells.

For compounds of Formula (I) or a form thereof disclosed herein, Table 4 provides the EC_(1.5x) for production of SMN2 full length mRNA that was obtained from the 7-point concentration data generated for each test compound according to the procedure of Biological Example 2. The term “EC_(1.5×) for production of full length SMN2 mRNA” is defined as that concentration of test compound that is effective in increasing the amount of SMN2 full length mRNA to a level 1.5-fold greater relative to that in vehicle-treated cells. An EC_(1.5×) for production of full length SMN2 mRNA between >3 μM and ≦30 μM is indicated by one star (*), an EC_(1.5×) between >1 μM and ≦3 μM is indicated by two stars (**), an EC_(1.5×) between >0.3 μM and ≦1 μM is indicated by three stars (***), an EC_(1.5×) between >0.1 μM and ≦0.3 μM is indicated by four stars (****) and an EC_(1.5×)≦0.1 μM is indicated by five stars (*****).

TABLE 4 Cpd EC_(1.5x) 1 **** 2 ***** 3 *** 4 ** 5 **** 6 * 7 * 8 * 9 **** 10 *** 11 *** 12 *** 13 ** 14 * 15 * 16 ** 17 *** 18 ** 19 *** 20 * 21 * 22 *** 23 *** 24 *** 25 *** 26 ** 27 **** 28 **** 29 ***** 30 **** 31 **** 32 ***** 33 ** 34 ** 35 * 36 *** 37 ***** 38 **** 39 ***** 40 *** 41 *** 42 * 43 **** 44 ***** 45 **** 46 ***** 47 ***** 48 **** 49 ***** 50 ***** 51 *** 52 * 53 **** 54 **** 55 ** 56 **** 57 *** 58 ***** 59 ***** 60 ***** 61 ***** 62 ***** 63 ***** 64 ***** 65 *** 66 **** 67 ***** 68 ***** 69 ***** 70 **** 71 **** 72 ***** 73 **** 74 ***** 75 **** 76 ***** 77 ***** 78 **** 79 ***** 80 ***** 81 **** 82 **** 83 ***** 84 ***** 85 **** 86 *** 87 **** 88 ***** 89 ***** 90 ***** 91 ***** 92 ***** 93 *** 94 ***** 95 ***** 96 *** 97 **** 98 **** 99 **** 100 ***** 101 ***** 102 ***** 103 **** 104 ***** 105 ***** 106 ***** 107 ***** 108 ***** 109 ***** 110 ***** 111 ***** 112 **** 113 ***** 114 ***** 115 ***** 116 ***** 117 **** 118 **** 119 ***** 120 ***** 121 ***** 122 ***** 123 **** 124 **** 125 **** 126 **** 127 ***** 128 ***** 129 ***** 130 **** 131 **** 132 **** 133 ***** 134 **** 135 ***** 136 ***** 137 ***** 138 ***** 139 ***** 140 *** 141 ***** 142 ***** 143 ***** 144 ***** 145 ***** 146 *****

Example 3 Endogenous SMN2 mRNA RT-qPCR Splicing Assay in Cultured Cells

The reverse transcription-quantitative PCR-based (RT-qPCR) assay is used to quantify the levels of the SMN2 full length and Δ7 mRNA in primary cells and cell lines containing the SMN2 gene treated with a test compound.

Materials

Material Source SMA Type 1 human cells GM03813 (Coriell Institute) Cells-To-Ct lysis buffer Life Technologies, Inc. (formerly Applied Biosystems) Catalog No.: 4399002 DMEM Life Technologies, Inc. (formerly Invitrogen) Catalog No.: 11960-044 96-well flat-bottom plates Becton Dickinson Catalog No.: 353072 RT-PCR Enzyme Mix Life Technologies, Inc. (formerly Applied Biosystems) Part No.: 4388520 (also included in AgPath-ID Kit Catalog No.: 4387391) RT-PCR buffer Life Technologies, Inc. (formerly Applied Biosystems) Part No.: 4388519 (also included in AgPath-ID Kit Catalog No.: 4387391) AgPath-ID One-Step RT- Life Technologies, Inc. (formerly Applied Biosystems) Catalog PCR Kit No.: 4387391 Thermocycler Life Technologies, Inc. (formerly Applied Biosystems) 7900HT

Protocol.

GM03813 SMA patient cells (5,000 cells/well) are seeded in 200 μL, of cell culture medium (DMEM plus 10% FBS) in 96-well flat-bottom plates and the plate is immediately swirled to ensure proper dispersal of cells, forming an even monolayer of cells. Cells are allowed to attach for at least 4-6 hrs. Test compounds are serially diluted 3.16-fold in 100% DMSO to generate a 7-point concentration curve. A solution of test compound (1 μL, 200× in DMSO) is added to each test well and 1 μL, DMSO is added to each control well. The plate is incubated for 24 hrs in a cell culture incubator (37° C., 5% CO₂, 100% relative humidity). The cells are then lysed in Cells-To-Ct lysis buffer and the lysate is stored at 80° C.

SMN2-specific spliced products and GAPDH mRNA are identified using the following primers and probes in Table 5. Primer SMN FL Forward B (SEQ ID NO. 7) hybridizes to a nucleotide sequence in exon 7 (nucleotide 32 to nucleotide 54) and exon 8 (nucleotide 1 to nucleotide 4), primer SMN Δ7 Forward B (SEQ ID NO. 8) hybridizes to a nucleotide sequence in exon 6 (nucleotide 87 to nucleotide 111) and exon 8 (nucleotide 1 to nucleotide 3), primer SMN Reverse B (SEQ ID NO. 9) hybridizes to a nucleotide sequence in exon 8 (nucleotide 39 to nucleotide 62), probe SMN Probe B (SEQ ID NO. 10) hybridizes to a nucleotide sequence in exon 8 (nucleotide 7 to nucleotide 36). These primers and probes hybridize to nucleotide sequences common to human SMN1 and SMN2 mRNA. Since the SMA patient cells used in Example 3 contain only the SMN2 gene, RT-qPCR can quantify only SMN2 full-length and Δ7 mRNA.

TABLE 5 Primer/Probe Sequence Source SMN FL Forward SEQ ID NO. 7: GCTCACATTCCTTAAATTAAGGAGAAA PTC¹  Primer B SMN A7 Forward SEQ ID NO. 8: TGGCTATCATACTGGCTATTATATGGAA PTC¹ Primer B SMN Reverse SEQ ID NO. 9: TCCAGATCTGTCTGATCGTTTCTT PTC¹ Primer B SMN Forward SEQ ID NO. 10: 6FAM- PTC¹ Probe B CTGGCATAGAGCAGCACTAAATGACACCAC-TAMRA hGAPDH Forward SEQ ID NO. 4: VIC-CGCCTGGTCACCAGGGCTGCT- LTI² Probe TAMRA hGAPDH Forward SEQ ID NO. 5: CAACGGATTTGGTCGTATTGG LTI² Primer hGAPDH Reverse SEQ ID NO. 6: TGATGGCAACAATATCCACTTTACC LTI² Primer ¹Primers and probe designed by PTC Therapeutics, Inc.; ²Commercially available from Life Technologies, Inc. (formerly Invitrogen).

The SMN forward and reverse primers are used at final concentrations of 0.4 μM. The SMN probe is used at a final concentration of 0.15 μM. GAPDH primers are used at final concentrations of 0.1 μM and the probe at 0.075 μM.

The SMN-GAPDH mix (10 μL total volume) is prepared by combining 5 μL of 2×RT-PCR buffer, 0.4 μL of 25×RT-PCR enzyme mix, 0.25 μL of 20×GAPDH primer-probe mix, 1.755 μL water, 2.5 μL of cell lysate, 0.04 μL of 100 μM SMN FL or SMN Δ7 forward primer, 0.04 μL of 100 μM SMN reverse primer, and 0.015 μL of 100 μM probe.

PCR is carried out at the following temperatures for the indicated time: Step 1: 48° C. (15 min); Step 2: 95° C. (10 min); Step 3: 95° C. (15 sec); Step 4: 60° C. (1 min); then, repeat Steps 3 and 4 for a total of 40 cycles.

Each reaction mixture contains either SMN2 FL and GAPDH or SMN2 Δ7 and GAPDH primers/probe sets (multiplex design), allowing simultaneous measurement of the levels of two transcripts.

The endogenous SMN2 gene gives rise to two alternatively spliced mRNA. The full length SMN2 mRNA that contains exon 7 is referred to herein using the term “SMN2 FL.” The truncated mRNA that lacks exon 7 is referred to herein using the term “SMN2 Δ7.”

The increase of SMN2 FL and decrease in SMN2 Δ7 mRNA relative to those in cells treated with vehicle control are determined from real-time PCR data using a modified ΔΔCt method (as described in Livak and Schmittgen, Methods, 2001, 25:402-8). The amplification efficiency (E) is calculated from the slope of the amplification curve for SMN2 FL, SMN2 Δ7, and GAPDH individually. The abundances of SMN2 FL, SMN2 Δ7, and GAPDH are then calculated as (1+E)^(−Ct), where Ct is the threshold value for each amplicon. The abundances of SMN2 FL and SMN2 Δ7 are normalized to GAPDH abundance. The normalized SMN2 FL and SMN2 Δ7 abundances from test compound-treated samples are then divided by normalized SMN2 FL and SMN2 Δ7 abundances, respectively, from vehicle-treated cells to determine the levels of SMN2 FL and SMN2 Δ7 mRNA relative to vehicle control.

Results.

As seen in FIG. 4, cells treated with increasing concentrations of Compound 5 (FIG. 4a ) and Compound 27 (FIG. 4b ) contain progressively more SMN2 FL mRNA and less SMN2 Δ7 mRNA than those treated with vehicle, indicating a correction of SMN2 alternative splicing.

Example 4 Endogenous SMN2 mRNA End-Point Semi-Quantitative RT-PCR Splicing Assay in Cultured Cells

The endpoint reverse transcription-PCR splicing assay is used to visualize and quantify the levels of the SMN2 full length and Δ7 mRNA in primary cells and cell lines containing the SMN2 gene treated with a test compound.

Materials

Material Source SMA Type 1 human cells GM03813 (Coriell Institute) Cells-To-Ct lysis buffer Life Technologies, Inc. (formerly Applied Biosystems) Catalog No.: 4399002 DMEM Life Technologies, Inc. (formerly Invitrogen) Catalog No.: 11960-044 96-well flat-bottom plates Becton Dickinson Catalog No.: 353072 Platinum Taq HiFi DNA Life Technologies, Inc. (formerly Invitrogen) Catalog No.: Polymerase Super Mix 11304-016 iScript RT enzyme Kit BioRad: Catalog No.: 170-8890 Ethidium bromide 2% Life Technologies, Inc. (formerly Invitrogen) Catalog No.: agarose E gels 48-Well G8008-02 Double Comb Gel Documentation System UVP Gel Doc It 310 Imaging system

Protocol.

GM03813 SMA patient cells (5,000 cells/well) are seeded in 200 μL of cell culture medium (DMEM plus 10% FBS) in 96-well flat-bottom plates and the plate is immediately swirled to ensure proper dispersal of cells, forming an even monolayer of cells. Cells are allowed to attach for at least 4-6 hrs. Test compounds are serially diluted 3.16-fold in 100% DMSO to generate a 7-point concentration curve. A solution of test compound (1 μL, 200× in DMSO) is added to each test well and 1 μL DMSO is added to each control well. The plate is incubated for 24 hrs in a cell culture incubator (37° C., 5% CO₂, 100% relative humidity). The cells are then lysed in Cells-To-Ct lysis buffer and the lysate is stored at 80° C.

SMN FL and Δ7 mRNA are identified using the following primers in Table 6. These primers hybridize to a nucleotide sequence in exon 6 (SMN Forward C, SEQ ID NO. 11) (nucleotide 43 to nucleotide 63) and exon 8 (SMN Reverse C, SEQ ID NO. 12) (nucleotide 51 to nucleotide 73) common to human SMN1 and SMN2 mRNA. Since the SMA patient cells used in Example 4 contain only the SMN2 gene, RT-PCR can visualize and quantify only SMN2 full-length and SMN2 Δ7 mRNA.

TABLE 6 Primer Sequence Source SMN Forward C SEQ ID NO. 11: GATGCTGATGCTTTGGGAAGT PTC¹ SMN Reverse C SEQ ID NO. 12: CGCTTCACATTCCAGATCTGTC PTC¹ ¹Primers designed by PTC Therapeutics, Inc.

To synthesize cDNA, 5 μL of lysate, 4 μL of 5× iScript reaction mix, 1 μL of reverse transcriptase, and 10 μL of water are combined and incubated 5 min at 25° C. followed by 30 min at 42° C., followed by 5 min at 85° C. The cDNA solution is stored at −20° C.

To perform endpoint PCR, 5 μL of cDNA, 0.2 μL of 100 μM forward primer, 0.2 μL of 100 μM reverse primer, and 22.5 μL of polymerase super mix are combined in a 96 well semiskirted PCR plate. PCR is carried out at the following temperatures for the indicated time: Step 1: 94° C. (2 min), Step 2: 94° C. (30 sec), Step 3: 55° C. (30 sec), Step 4: 68° C. (1 min), then repeat Steps 2 to 4 for a total of 33 cycles, then hold at 4° C.

10 μL of each PCR sample is electrophoretically separated on a 2% agarose E-gel for 14 minutes stained with double-stranded DNA (dsDNA) staining reagents (e.g., ethidium bromide) and visualized using a gel imager.

Results.

As seen in FIG. 5, cells treated with increasing concentrations of Compound 5 (FIG. 5a ) or Compound 27 (FIG. 5b ) contain progressively more SMN2 FL mRNA and less SMN2 Δ7 mRNA, indicating a correction of SMN2 alternative splicing.

Example 5 SMN2 mRNA RT-qPCR Splicing Assay in Animal Tissues

The reverse transcription-quantitative PCR-based (RT-qPCR) assay is used to quantify the levels of the full length and SMN2 Δ7 mRNA in tissues from mice treated with test compound.

Materials

Material Source Tissues from C/C-allele SMA mice The Jackson Laboratory, strain No.: 008714 (B6.129- Smn1^(tm5(Smn1/SMN2)Mrph)/J) Tissues from Δ7 SMA mice The Jackson Laboratory, strain No.: 005025 (FVB.Cg- Tg(SMN2*delta7)4299Ahmb Tg(SMN2)89Ahmb Smn1^(tm1Msd)/J) RT-PCR Enzyme Mix Life Technologies, Inc. (formerly Applied Biosystems) Part No.: 4388520 (also included in AgPath-ID Kit Catalog No.: 4387391) RT-PCR buffer Life Technologies, Inc. (formerly Applied Biosystems) Part No.: 4388519 (also included in AgPath-ID Kit Catalog No.: 4387391) AgPath-ID One-Step RT-PCR Life Technologies, Inc. (formerly Applied Biosystems) Kit Catalog No.: 4387391 Mouse GAPDH primers and Life Technologies, Inc. (formerly Applied Biosystems) probes Catalog No.: 4352339E QIAzol Lysis Reagent Qiagen Catalog No.: 79306 RNeasy Lipid Tissue Mini Kit Qiagen Catalog No.: 74804 5 mm Stainless Steel Bead Qiagen Catalog No.: 69989 TissueLyzer II Qiagen Catalog No.: 85300 Thermocycler Life Technologies, Inc. (formerly Applied Biosystems) 7900HT

Protocol.

C/C-allele SMA mice are treated by oral gavage two times per day (BID) for 10 days with test compounds re-suspended in 0.5% hydroxypropylmethyl cellulose (HPMC) and 0.1% Tween-80. Tissue samples were collected and snap frozen for RNA purification.

Tissue samples (20-40 mg) are homogenized in QIAzol Lysis Reagent for 2 minutes at 20 Hz in the TissueLyser II using one stainless steel bead. After addition of chloroform, the homogenate is separated into aqueous and organic phases by centrifugation. RNA partitioned to the upper, aqueous phase is extracted and ethanol is added to provide appropriate binding conditions. The sample is then applied to the RNeasy spin column from the RNeasy Mini Kit, where total RNA binds to the membrane. The RNA is eluted in RNase-free water then stored at −20° C. and subsequently analyzed using the TaqMan RT-qPCR on the 7900HT Thermocycler. Total RNA is diluted ten fold and 2.5 μL of the diluted sample is added to the TaqMan RT-qPCR mixture.

SMN2 spliced products are identified using the following primers and probe in Table 7. Primer SMN FL Forward B (SEQ ID NO. 7) hybridizes to a nucleotide sequence in exons 7 and 8, primer SMN Δ7 Forward B (SEQ ID NO. 8) hybridizes to a nucleotide sequence in exons 6 and 8, primer SMN Reverse B (SEQ ID NO. 9) hybridizes to a nucleotide sequence in exon 8, probe SMN Probe B (SEQ ID NO. 10) hybridizes to a nucleotide sequence in exon 8. These primers and probe hybridize to nucleotide sequences common to human SMN1 and SMN2 mRNA. Since the SMA patient cells used in Example 5 contain only the SMN2 gene, RT-qPCR can quantify only SMN2 full-length and Δ7 mRNA.

TABLE 7 Primer/Probe Sequence Source SMN FL Forward SEQ ID NO. 7: GCTCACATTCCTTAAATTAAGGAGAAA PTC¹ Primer B SMN Δ7 Forward SEQ ID NO. 8: TGGCTATCATACTGGCTATTATATGGAA PTC¹ Primer B SMN Reverse SEQ ID NO. 9: TCCAGATCTGTCTGATCGTTTCTT PTC¹ Primer B SMN Forward SEQ ID NO. 10: 6FAM- PTC¹ Probe B CTGGCATAGAGCAGCACTAAATGACACCAC-TAMRA ¹Primers and probe designed by PTC Therapeutics, Inc.

The SMN forward and reverse primers are used at final concentrations of 0.4 μM. The SMN probe is used at a final concentration of 0.15 μM. The SMN-GAPDH Mix (10 μL total volume) is prepared by combining 5 μL of 2×RT-PCR buffer, 0.4 μL of 25×RT-PCR enzyme mix, 0.5 μL of 20×GAPDH primer-probe mix, 1.505 μL of water, 2.5 μL of RNA solution, 0.04 μL of 100 μM forward primer, 0.04 μL of 100 μM reverse primer, and 0.015 μL of 100 μM SMN probe.

Each PCR cycle was carried out at the following temperatures for the indicated time: Step 1: 48° C. (15 min); Step 2: 95° C. (10 min); Step 3: 95° C. (15 sec); Step 4: 60° C. (1 min); then, repeat Steps 3 and 4 for a total of 40 cycles.

Each reaction mixture contains either SMN2 FL and mGAPDH or SMN2 Δ7 and mGAPDH primers/probe sets (multiplex design), allowing simultaneous measurement of the levels of two transcripts.

The increase of SMN2 FL and decrease in SMN2 Δ7 mRNA relative to those in tissues from animals treated with vehicle control are determined from real-time PCR data using a modified ΔΔCt method (as described in Livak and Schmittgen, Methods, 2001, 25:402-8). The amplification efficiency (E) is calculated from the slope of the amplification curve for SMN2 FL, SMN2 Δ7, and GAPDH individually. The abundances of SMN2 FL, SMN2 Δ7, and GAPDH are then calculated as (1+E)^(−Ct), where Ct is the threshold value for each amplicon. The abundances of SMN2 FL and SMN2 Δ7 are normalized to GAPDH abundance. The normalized SMN2 FL and SMN2 Δ7 abundances from test compound-treated samples are then divided by normalized SMN2 FL and SMN2 Δ7 abundances, respectively, from vehicle-treated cells to determine the levels of SMN2 FL and SMN2 Δ7 mRNA relative to vehicle control.

Example 6 Endogenous SMN2 mRNA End-Point Semi-Quantitative RT-PCR Splicing Assay in Animal Tissues

The endpoint reverse transcription-PCR (RT-PCR) splicing assay is used to quantify the levels of the full length and Δ7 SMN2 mRNA in tissues from mice treated with test compound.

Materials

Material Source Tissues from C/C-allele SMA The Jackson Laboratory, strain No.: 008714 (B6.129- mice Smn1^(tm5(Smn1/SMN2)Mrph)/J) Tissues from ΔExon7 SMA The Jackson Laboratory, strain No.: 005025 (FVB.Cg- mice Tg(SMN2*delta7)4299Ahmb Tg(SMN2)89Ahmb Smn1^(tm1Msd/)J) Qiagen RNeasy lipid Kit Qiagen Catalog No.: 74804 Platinum Taq HiFi DNA Life Technologies, Inc. (formerly Invitrogen) Catalog No.: Polymerase Super Mix 11304-016 iScript RT enzyme Kit BioRad Catalog No.: 170-8890 Twin.tec 96-Well Semiskirted Eppendorf Catalog No.: 951020389 PCR Plate Ethidium bromide 2% agarose E Life Technologies, Inc. (formerly Invitrogen) Catalog No.: gels 48-Well Double Comb G8008-02 Gel Documentation System UVP Gel Doc It 310 Imaging system

Protocol.

C/C-allele SMA mice are treated by oral gavage BID for 10 days with test compounds in 0.5% HPMC and 0.1% Tween-80. Tissue samples are collected and snap frozen for RNA purification.

Tissue samples (20-40 mg) are homogenized in QIAzol Lysis Reagent for 2 minutes at 20 Hz in the TissueLyser II using one stainless steel bead. After addition of chloroform, the homogenate is separated into aqueous and organic phases by centrifugation. RNA partitioned to the upper, aqueous phase is extracted and ethanol is added to provide appropriate binding conditions. The sample is then applied to the RNeasy spin column from the RNeasy Mini Kit, where total RNA binds to the membrane. The RNA is eluted in RNase-free water then stored at −20° C.

SMN2 spliced products are identified using the following amplification primers in Table 8. These primers hybridize to a nucleotide sequence in exon 6 (SMN Forward D, SEQ ID NO. 13) (nucleotide 22 to nucleotide 46) and exon 8 (SMN Reverse C, SEQ ID NO. 12), common to both human SMN1 and SMN2 mRNA.

TABLE 8 Primer Sequence Source SMN Forward D SEQ ID NO. 13: ATATGTCCAGATTCTCTTGATGATG PTC¹ SMN Reverse C SEQ ID NO. 12: CGCTTCACATTCCAGATCTGTC PTC¹ ¹Primers designed by PTC Therapeutics, Inc.

To synthesize cDNA, combine 1 μL of RNA solution (25-50 ng), 4 μL of 5× iScript reaction mix, 1 μL of reverse transcriptase and 10 μL of water and incubate the mixture at 25° C. for 5 min, followed by 42° C. for 30 min, then 85° C. for 5 min. The cDNA solution is stored at −20° C.

To perform endpoint PCR, combine 5 μL of cDNA, 0.2 μL of 100 μM forward primer, 0.2 μL of 100 μM reverse primer and 22.5 μL of polymerase super mix in a 96 well semiskirted PCR plate. PCR is carried out at the following temperatures for the indicated time: Step 1: 94° C. (2 min), Step 2: 94° C. (30 sec), Step 3: 55° C. (30 sec), Step 4: 68° C. (1 min), then repeat Steps 2 to 4 for a total of 33 cycles, then hold at 4° C.

10 μL of each PCR sample is electrophoretically separated on a 2% agarose E-gel for 14 minutes stained with dsDNA staining reagents (e.g., ethidium bromide) and visualized using a gel imager.

Example 7 Smn Protein Assay in Cultured Cells

The Smn HTRF (homogeneous time resolved fluorescence) assay is used to quantify the level of Smn protein in SMA patient fibroblast cells treated with test compounds. The results of the assay are shown in Table 9.

Materials

Material Source SMA Type 1 human cells GM03813 (Coriell Institute) Protease inhibitor cocktail Roche Applied Science Catalog No.: 11836145001 Anti-SMN d2 Blue cap Cisbio Catalog No.: 63IDC002-SMN Anti-SMN kryptate Red cap Cisbio Catalog No.: 63IDC002-SMN SMN reconstitution buffer Cisbio Catalog No.: 63IDC002-SMN-Buffer DMEM Life Technologies, Inc. (formerly Invitrogen) Catalog No.: 11960-044 RIPA Lysis Buffer 20 mM Tris-HCl pH 7.5, 150 mM NaCl, 1 mM EDTA, 1% NP-40, 1% Sodium deoxycholate Diluent Buffer 20 mM Tris-HCl pH 7.5, 150 mM NaCl Envision Plate Reader Perkin Elmer Model No.: 2103

Protocol.

Cells are thawed and cultured in DMEM-10% FBS for 72 hours. Cells are trypsinized, counted and re-suspended to a concentration of 25,000 cells/mL in DMEM-10% FBS. The cell suspension is plated at 5,000 cells per well in a 96 well microtiter plate and incubated for 3 to 5 hours. To provide a control signal, three (3) wells in the 96 well plate do not receive cells and, thus, serve as Blank control wells. Test compounds are serially diluted 3.16-fold in 100% DMSO to generate a 7-point concentration curve. 1 μL of test compound solution is transferred to cell-containing wells and cells are incubated for 48 hours in a cell culture incubator (37° C., 5% CO₂, 100% relative humidity). Triplicate samples are set up for each test compound concentration. After 48 hours, the supernatant is removed from the wells and 25 μL of the RIPA lysis buffer, containing protease inhibitors, is added to the wells and incubated with shaking at room temperature for 1 hour. 25 μL of the diluent is added and then 35 μL of the resulting lysate is transferred to a 384-well plate, where each well contains 5 μL of the antibody solution (1:100 dilution of anti-SMN d2 and anti-SMN kryptate in SMN reconstitution buffer). The plate is centrifuged for 1 minute to bring the solution to the bottom of the wells, then incubated overnight at room temperature. Fluorescence for each well of the plate at 665 nm and 620 nm is measured on an EnVision multilabel plate reader (Perkin-Elmer).

The normalized fluorescence signal is calculated for each sample, Blank and vehicle control well by dividing the signal at 665 nm by the signal at 620 nm. Normalizing the signal accounts for possible fluorescence quenching due to the matrix effect of the lysate. The ΔF value (a measurement of Smn protein abundance as a percent value) for each sample well is calculated by subtracting the normalized average fluorescence for the Blank control wells from the normalized fluorescence for each sample well, then dividing this difference by the normalized average fluorescence for the Blank control wells and multiplying the resulting value by 100. The ΔF value for each sample well represents the Smn protein abundance from test compound-treated samples. The ΔF value for each sample well is divided by the ΔF value for the vehicle control wells to calculate the fold increase in Smn protein abundance relative to the vehicle control.

Results.

As seen in FIG. 6, SMA Type 1 patient fibroblast cells treated with Compound 5 (FIG. 6a ) and Compound 27 (FIG. 6b ) show a dose dependent increase in Smn protein expression as measured by the SMN HTRF assay.

For compounds of Formula (I) or a form thereof disclosed herein, Table 9 provides the EC_(1.5×) for Smn protein expression that was obtained from the 7-point concentration data generated for each test compound according to the procedure of Biological Example 7. The term “EC_(1.5×) for Smn protein expression” is defined as that concentration of test compound that is effective in producing 1.5 times the amount of Smn protein in an SMA patient fibroblast cell compared to the amount produced from the DMSO vehicle control. An EC_(1.5×) for Smn protein expression between >3 μM and ≦10 μM is indicated by one star (*), an EC_(1.5×) between >1 and ≦3 μM is indicated by two stars (**), an EC_(1.5×) between >0.3 μM and ≦1 μM is indicated by three stars (***) and an EC_(1.5×)≦0.3 μM is indicated by four stars (****).

TABLE 9 Cpd EC_(1.5x) Cpd EC_(1.5x) Cpd EC_(1.5x) 1 *** 67 *** 109 **** 2 **** 68 *** 110 **** 3 * 69 **** 111 **** 5 *** 72 **** 112 ** 8 * 73 ** 113 *** 10 *** 74 *** 114 *** 22 *** 75 *** 116 *** 27 ** 76 **** 117 *** 30 ** 77 **** 118 ** 33 * 78 **** 119 **** 36 ** 79 **** 121 * 37 ** 80 **** 122 **** 38 *** 81 **** 123 *** 39 **** 82 *** 124 *** 43 **** 83 **** 125 **** 44 ** 84 **** 127 *** 45 *** 87 **** 128 **** 46 **** 88 **** 129 **** 47 **** 89 **** 130 * 48 *** 90 **** 133 *** 49 *** 91 **** 134 * 50 **** 92 **** 135 *** 54 *** 94 **** 136 *** 55 ** 95 **** 137 *** 56 * 97 ** 138 **** 58 **** 98 ** 139 **** 59 **** 101 *** 140 ** 60 ** 102 **** 141 **** 61 **** 103 *** 142 *** 62 **** 105 ** 143 *** 63 **** 106 *** 144 **** 64 **** 107 *** 145 **** 65 **** 108 **** 146 **** 66 **

For compounds of Formula (I) or a form thereof disclosed herein, Table 10 provides the maximum fold (Fold) increase of Smn protein that was obtained from the 7-point concentration data generated for each test compound according to the procedure of Biological Example 7. A maximum fold increase ≦1.2 is indicated by one star (*), a fold increase between >1.2 and ≦1.35 is indicated by two stars (**), a fold increase between >1.35 and ≦1.5 is indicated by three stars (***), a fold increase between >1.5 and ≦1.65 is indicated by four stars (****) and a fold increase >1.65 is indicated by five stars (*****).

TABLE 10 Cpd Fold Cpd Fold Cpd Fold 1 *** 50 ***** 99 *** 2 ***** 51 ** 100 *** 3 *** 52 * 101 **** 4 ** 53 *** 102 ***** 5 **** 54 **** 103 **** 6 ** 55 *** 104 ** 7 * 56 ** 105 *** 8 ***** 57 ** 106 *** 9 * 58 **** 107 **** 10 *** 59 **** 108 **** 11 * 60 *** 109 **** 12 *** 61 **** 110 **** 13 *** 62 **** 111 *** 14 * 63 **** 112 *** 15 ** 64 **** 113 **** 16 * 65 **** 114 **** 17 *** 66 *** 115 *** 18 * 67 **** 116 *** 19 ** 68 **** 117 **** 20 * 69 ***** 118 *** 21 * 70 *** 119 **** 22 **** 71 ** 120 *** 23 ** 72 **** 121 *** 24 ** 73 *** 122 **** 25 *** 74 **** 123 **** 26 ** 75 **** 124 **** 27 **** 76 ***** 125 ***** 28 *** 77 ***** 126 *** 29 *** 78 ***** 127 **** 30 *** 79 ***** 128 ***** 31 ** 80 **** 129 ***** 32 *** 81 ***** 130 *** 33 *** 82 **** 131 *** 34 *** 83 **** 132 ** 35 ** 84 ***** 133 *** 36 **** 85 ** 134 *** 37 *** 86 ** 135 ***** 38 ***** 87 ***** 136 *** 39 **** 88 **** 137 **** 40 ** 89 **** 138 **** 41 ** 90 ***** 139 **** 42 ** 91 ***** 140 **** 43 **** 92 **** 141 **** 44 *** 93 *** 142 **** 45 **** 94 **** 143 **** 46 **** 95 ***** 144 **** 47 ***** 96 *** 145 **** 48 **** 97 **** 146 **** 49 **** 98 ****

Example 8 Gems Count (Smn-Dependent Nuclear Speckle Count) Assay

The level of Smn protein directly correlates with the amount of nuclear foci, also known as gems, produced upon staining the cell with a fluorescently labeled anti-Smn antibody (Liu and Dreyfuss, EMBO J., 1996, 15:3555). Gems are multi-protein complexes whose formation is nucleated by the Smn protein and the gems count assay is used to evaluate the level of Smn protein in the cell. As described herein, the gems count assay is used to quantify the level of Smn protein in SMA patient fibroblast cells treated with a test compound.

Materials

Material Source SMA Type 1 human cells GM03813 (Coriell Institute) Primary Antibody-mouse Sigma Catalog No.: S2944 anti-SMN clone 2B1 Secondary Antibody- Life Technologies, Inc. (formerly Invitrogen) anti-mouse Catalog No.: A21422 Alexa Fluor 555 Bovine Serum Albumin Sigma Catalog No.: A3294 (BSA) 4% Paraformaldehyde Electron Microscopy Sciences Bortezomib Catalog No.: 15710 LC Labs, Catalog No.: B-1408 0.05% Triton X-100 Sigma Catalog No.: 93443 (100 mL) Mounting medium- Life Technologies, Inc. (formerly Invitrogen) ProLong Gold Antifade Catalog Nos.: P7481 and P36935 Reagent with DAPI 22x22 #1 sterile Cover Fisher Catalog No.: 12-548-B slips DMEM Life Technologies, Inc. (formerly Invitrogen) Catalog No.: 11960-044 PBS Life Technologies, Inc. (formerly Invitrogen) Catalog No.: 10010-031 Clear-coat nail polish Revlon brand Catalog No.: 1271-76 Zeiss Axovert 135 Zeiss Fluorescence microscope

Protocol:

Cells are thawed and incubated in DMEM-10% FBS for 72 hours, then trypsinized, counted and resuspended to 100,000 cells/mL in DMEM-10% FBS. The cell suspension (2 mL) is plated in a 6-well cell culture plate with a sterile cover slip and incubated for 3 to 5 hours. Test compounds are serially diluted 3.16-fold in 100% DMSO to generate a 7-point dilution curve. 10 μL of test compound solution is added to each cell-containing well and incubated for 48 hours in a cell culture incubator (37° C., 5% CO₂, 100% relative humidity). Duplicates are set up for each test compound concentration. Cells containing DMSO at a final concentration of 0.5% are used as controls.

Cell culture medium is aspirated from the wells containing cover slips and gently washed three times with cold PBS. The cells are fixed by incubation for 20 minutes at room temperature while in paraformaldehyde. The cells are then washed two times with cold PBS followed by incubation for 5 minutes at room temperature with 0.05% Triton X-100 in PBS to permeabilize the cells. After the fixed cells are washed three times with cold PBS, they are blocked with 10% FBS for 1 hour. 60 μL of primary antibody diluted 1:1000 in blocking buffer is added and the mixture is incubated for one hour at room temperature. The cells are washed three times with PBS and 60 μL, of secondary antibody diluted 1:5000 in blocking buffer is added, then the mixture is incubated for one hour at room temperature. The cover slips are mounted onto the slides with the aid of mounting medium and allowed to dry overnight. Nail polish is applied to the sides of the cover slip and the slides are stored, protected from light. A Zeiss Axovert 135 with a 63× Plan-Apochromat, NA=1.4 objective is used for immunofluorescence detection and counting. The number of gems is counted per ≧150 nuclei and % activation is calculated using DMSO and 10 nM bortezomib as controls. For each test compound, the cells are examined at all wavelengths to identify test compounds with inherent fluorescence.

Results.

As seen in FIG. 7, SMA Type 1 patient cells treated with Compound 5 contain progressively more gems relative to cells treated with DMSO.

Example 9 Smn Protein Assay in Human Motor Neurons

Smn immunofluorescent confocal microscopy is used to quantify the level of Smn protein in human motor neurons treated with test compounds.

Protocol.

Human motor neurons derived from SMA iPS cells (Ebert et al., Nature, 2009, 457:2770; and, Rubin et al., BMC Biology, 2011, 9:42) are treated with test compound at various concentrations for 72 hours. The level of Smn protein in the cell nucleus is quantified using Smn immunostaining and confocal fluorescence microscopy essentially as described in Makhortova et al., Nature Chemical Biology, 2011, 7:544. The level of Smn protein in compound-treated samples is normalized to that in vehicle-treated samples and plotted as a function of the compound concentration.

Example 10 Smn Protein Assay in Animal Tissues

The Smn HTRF protein assay is used to quantify the level of Smn protein in mouse tissues.

Materials

Material Source Tissues from C/C-allele The Jackson Laboratory, strain No.: 008714 (B6.129- SMA mice Smn1^(tm5(Smn1/SMN2)Mrph)/J) Tissues from Δ7 SMA mice The Jackson Laboratory, strain No.: 005025 (FVB.Cg-Tg (SMN2*delta7)4299Ahmb Tg(SMN2)89Ahmb Smn1^(tm1Msd)/J) Protease inhibitor cocktail Roche Applied Science Catalog No.: 11836145001 Anti-SMN d2 Blue cap Cisbio Catalog No.: 63IDC002-SMN Anti-SMN kryptate Red cap Cisbio Catalog No.: 63IDC002-SMN SMN reconstitution buffer Cisbio Catalog No.: 63IDC002-SMN-Buffer RIPA Lysis Buffer 20 mM Tris-HCl pH 7.5, 150 mM NaCl, 1 mM EDTA, 1% NP-40, 1% Sodium deoxycholate Diluent Buffer 20 mM Tris-HCl pH 7.5, 150 mM NaCl BCA protein assay Kit Pierce Catalog No.: 23225 White 384 well plate Nunc Catalog No.: 351190 Polypropylene V-bottom plate Falcon Catalog No.: 165195 Clear 96 well polystyrene plate Nunc Catalog No.: 442404 5 mm Stainless Steel Beads Qiagen Catalog No.: 69989 Safe-Lock Tubes 2.0 mL Eppendorf Catalog No.: 022363352 Twin.tec 96-Well Eppendorf Catalog No.: 951020389 Semiskirted PCR Plate TissueLyzer II Qiagen Catalog No.: 85300 Envision Plate Reader Perkin Elmer Model No.: 2103

Protocol.

The tissue samples in Safe-Lock tubes are weighed and the volume of RIPA buffer containing the protease inhibitor cocktail is added based on the weight to volume ratios for each type of tissue: Brain (50 mg/mL), Muscle (50 mg/mL) and Spinal Cord (25 mg/mL).

Tissues are homogenized using the TissueLyzer by bead milling. 5 mm stainless steel beads are added to the sample and shaken vigorously for 5 minutes at 30 Hz in the TissueLyzer. The samples are then centrifuged for 20 minutes at 14,000×g in a microcentrifuge and the homogenates transferred to the PCR plate. The homogenates are diluted in RIPA buffer to approximately 1 mg/mL for HTRF and approximately 0.5 mg/mL for total protein measurement using the BCA protein assay. For the SMN HTRF assay, 35 μL of the tissue homogenate is transferred to a 384-well plate containing 5 μL of the antibody solution (1:100 dilution of each of the anti-SMNd2 and anti-SMN Kryptate in reconstitution buffer). To provide a control signal, three (3) wells in the plate contain only RIPA Lysis Buffer and, thus, serve as Blank control wells. The plate is centrifuged for 1 minute to bring the solution to the bottom of the wells and then incubated overnight at room temperature. Fluorescence for each well of the plate at 665 nm and 620 nm is measured on an EnVision multilabel plate reader (Perkin-Elmer). The total protein in the tissue homogenate is measured using the BCA assay according to the manufacturer's protocol.

The normalized fluorescence signal is calculated for each sample, Blank and vehicle control well by dividing the signal at 665 nm by the signal at 620 nm. Normalizing the signal accounts for possible fluorescence quenching due to the matrix effect of the tissue homogenate. The ΔF value (a measurement of Smn protein abundance as a percent value) for each tissue sample well is calculated by subtracting the normalized average fluorescence for the Blank control wells from the normalized fluorescence for each tissue sample well, then dividing this difference by the normalized average fluorescence for the Blank control wells and multiplying the resulting value by 100. The ΔF value for each tissue sample well is divided by the total protein quantity (determined using the BCA assay) for that tissue sample. The change in Smn protein abundance for each tissue sample relative to the vehicle control is calculated as the percent difference in the ΔF value of the tissue sample in the presence of the test compound and the averaged ΔF value of the vehicle control signal divided by the averaged ΔF value of the vehicle control signal.

Example 11 Smn Protein Assay in Tissues of Adult C/C-Allele SMA Mice

The tissue samples used to quantify Smn protein in adult C/C-allele SMA mice are prepared as described in Example 10. The assay assesses whether treatment of C/C-allele SMA mice with a test compound for 10 days increases levels of Smn protein produced from the SMN2 gene and the hybrid mouse Smn1-SMN2 gene.

Materials

Material Source Tissues from C/C-allele The Jackson Laboratory, strain No.: 008714 SMA mice (B6.129-Smn1^(tm5(Smn1/SMN2)Mrph)/J)

Protocol.

C/C-allele SMA mice are dosed BID orally (in 0.5% HPMC with 0.1% Tween-80) with a test compound or vehicle at 10 mg/kg for 10 days. Age-matched heterozygous mice are dosed with vehicle for use as a control. Tissues are collected for analysis of protein levels according to Example 10.

Results.

As seen in FIG. 8, the total protein-normalized Smn level was increased relative to the vehicle group in brain, spinal cord, and muscle tissues of adult C/C-allele SMA mice treated at 50 mg/kg BID for 10 days with Compound 5.

Example 12 Smn Protein in Tissues of Neonatal Δ7 SMA Mice

The tissue samples used to quantify Smn protein in neonatal Δ7 SMA mice are prepared as described in Example 10. The assay assesses whether treatment of neonatal Δ7 SMA mice with a test compound for 7 days increases Smn protein levels produced from the SMN2 gene.

Materials

Material Source Tissues from Δ7 The Jackson Laboratory, strain No.: SMA mice 005025 (FVB.Cg-Tg(SMN2*delta7)4299Ahmb Tg(SMN2)89Ahmb Smn1^(tm1Msd)/J)

Protocol.

SMA Δ7 homozygous knockout mice are dosed once a day (QD) intraperitoneally (IP) with a test compound or vehicle (100% DMSO) from postnatal day (PND) 3 to PND 9. Tissues are collected for analysis of protein levels according to Example 10.

Results.

As seen in FIG. 9, total protein normalized Smn level was dose dependently increased in brain (FIG. 9a ), spinal cord (FIG. 9b ) and muscle (FIG. 9c ) tissues of neonatal SMA Δ7 homozygous knockout mice treated with Compound 27.

Example 13 Body Weight of Neonatal Δ7 SMA Mice

The change in body weight of neonatal Δ7 SMA mice is used to determine whether treatment with a test compound improves body weight.

Materials

Material Source Tissues from The Jackson Laboratory, strain No.: 005025 ΔExon7 SMA mice (FVB.Cg-Tg(SMN2*delta7)4299Ahmb Tg(SMN2)89Ahmb Smn1^(tm1Msd)/J)

Protocol.

SMA Δ7 homozygous knockout mice are dosed IP with test compound or vehicle (100% DMSO) QD from PND 3 until the dose regimen is switched to an oral dose BID in 0.5% HPMC with 0.1% Tween-80 at a dose 3.16-fold higher than the dose used for IP. Body weights of SMA Δ7 mice treated with test compound or vehicle and age matched heterozygous mice are recorded every day.

Example 14 Righting Reflex in Neonatal Δ7 SMA Mice

The functional change in righting reflex of neonatal Δ7 SMA mice is used to determine whether treatment with a test compound improves righting reflex.

Materials

Material Source Tissues from The Jackson Laboratory, strain No.: 005025 ΔExon7 SMA mice (FVB.Cg-Tg(SMN2*delta7)4299Ahmb Tg(SMN2)89Ahmb Smn1^(tm1Msd)/J)

Protocol.

SMA Δ7 homozygous knockout mice are dosed IP with test compound or vehicle (100% DMSO) QD from PND 3 until the dose regimen is switched to an oral dose BID in 0.5% HPMC with 0.1% Tween-80 at a dose 3.16-fold higher than the dose used for IP. The righting reflex time is measured as the time taken by a mouse to flip over onto its feet after being laid on its back. Righting reflex time is measured five times for each mouse (allowing a maximal time of 30 sec for each try) with 5 minutes between each measurement. The righting reflex time for SMA Δ7 homozygous knockout mice treated with test compound or vehicle and age-matched heterozygous mice is measured on PND 10, 14 and 18 and plotted.

Example 15 Survival of Neonatal Δ7 SMA Mice

The change in the number of surviving mice over time is used to determine whether treatment with a test compound improves survival.

Materials

Material Source Tissues from Δ7 The Jackson Laboratory, strain No.: 005025 SMA mice (FVB.Cg-Tg(SMN2*delta7)4299Ahmb Tg(SMN2)89Ahmb Smn1^(tm1Msd)/J)

Protocol.

SMA Δ7 homozygous knockout mice are dosed IP with test compound or vehicle (100% DMSO) QD from PND 3 until the dose regimen is switched to an oral dose BID in 0.5% HPMC with 0.1% Tween-80 at a dose 3.16-fold higher than the dose used for IP and later switched to an oral dose QD in 0.5% HPMC with 0.1% Tween-80 at a dose 6.32-fold higher than the dose used for IP. The number of surviving mice in each group is recorded every day and plotted as a percent of total number of mice.

Example 16 Human SMN1 Minigene mRNA End-Point Semi-Quantitative RT-PCR Splicing Assay in Cultured Cells

The RT-PCR assay is used to visualize and quantify the levels of the human SMN1 minigene full length and Δ7 mRNA in primary cells and cell lines expressing the human SMN1 minigene construct treated with a test compound.

Materials

Material Source HEK293H cells Life Technologies, Inc. (formerly Invitrogen) Catalog No.: 11631-017 Cells-To-Ct lysis buffer Life Technologies, Inc. (formerly Applied Biosystems) Catalog No.: 4399002 FuGENE-6 lipid transfection Roche Applied Science, Catalog No.: 11 814 443 001 reagent DMEM Life Technologies, Inc. (formerly Invitrogen) Catalog No.: 11960-044 96-well flat-bottom plates Becton Dickinson Catalog No.: 353072 Platinum Taq HiFi DNA Life Technologies, Inc. (formerly Invitrogen) Catalog No.: Polymerase Super Mix 11304-016 iScript RT enzyme Kit BioRad Catalog No.: 170-8890 Ethidium bromide 2% agarose Life Technologies, Inc. (formerly Invitrogen) Catalog No.: E gels 48-Well Double Comb G8008-02 Gel Documentation System UVP Gel Doc It 310 Imaging system

SMN1 Minigene Construct

Preparation of the Minigene Construct

Using the procedure for the preparation of the SMN2 minigene construct described in Biological Example 1, the SMN1 version of the minigene is generated by replacing the sixth nucleotide of exon 7 (a thymine residue) of the SMN2-A minigene construct to cytosine using site-directed mutagenesis. Thus, similar to the SMN2-A minigene construct, the SMN1 minigene construct has a single adenine residue inserted after nucleic residue 48 of exon 7. The SMN1 minigene construct is referred to as SMN1-A.

Protocol.

HEK293H cells (10,000 cells/well/199 μL) were transfected, using FuGENE-6 reagent, in a 96-well plate with 15 ng of the SMN1-A minigene reporter plasmid per well. Cells were incubated for 24 hours following transfection. Test compounds were serially diluted 3.16-fold in 100% DMSO to generate a 7-point concentration curve. A solution of test compound (1 μL, 200× in DMSO) was added to each test well. 1 μL DMSO was added to each control well. The plate was incubated for 7 hours in a cell culture incubator (37° C., 5% CO₂, 100% relative humidity). The cells were then lysed in Cells-To-Ct lysis buffer and the lysates were stored at −80° C.

Two SMN spliced mRNA are generated from the SMN1 minigene. The term “SMN1 minigene FL” refers to the first spliced product containing exon 7, corresponding to full length SMN1 mRNA. The term “SMN1 minigene A7” refers to the second product lacking exon 7.

SMN1 minigene FL and SMN1 minigene Δ7 mRNA are amplified using the primers in Table 11. Primer SMN Forward C (SEQ ID NO. 11) hybridizes to a nucleotide sequence in exon 6 (nucleotide 43 to nucleotide 63), primer SMN Reverse A (SEQ ID NO. 2) hybridizes to a nucleotide sequence in the coding sequence of Firefly luciferase. The combination of these two oligonucleotides detects only SMN1 or SMN2 minigenes (RT-PCR) and will not detect endogenous SMN1 or SMN2 genes. Since the HEK293H cells used in Example 16 were transfected with only the human SMN1 minigene, RT-PCR can visualize and quantify only SMN1 minigene FL and SMN1 minigene Δ7 mRNA.

TABLE 11 Primer Sequence Source SMN Forward C SEQ ID NO. 11: GATGCTGATGCTTTGGGAAGT PTC¹ SMN Reverse A SEQ ID NO. 2: CGCTTCACATTCCAGATCTGTC PTC¹ ¹Primers designed by PTC Therapeutics, Inc.

To synthesize cDNA, 5 μL of lysate, 4 μL of 5× iScript reaction mix, 1 μL of reverse transcriptase, and 10 μL of water are combined and incubated 5 min at 25° C. followed by 30 min at 42° C., followed by 5 min at 85° C. The cDNA solution is stored at −20° C.

To perform endpoint PCR, 5 μL of cDNA, 0.2 μL of 100 μM forward primer, 0.2 μL of 100 μM reverse primer, and 22.5 μL of polymerase super mix are combined in a 96 well semiskirted PCR plate. PCR is carried out at the following temperatures for the indicated time: Step 1: 94° C. (2 min), Step 2: 94° C. (30 sec), Step 3: 55° C. (30 sec), Step 4: 68° C. (1 min), then repeat Steps 2 to 4 for a total of 33 cycles, then hold at 4° C.

10 μL of each PCR sample is electrophoretically separated on a 2% agarose E-gel for 14 minutes stained with dsDNA staining reagents (e.g., ethidium bromide) and visualized using a gel imager.

Results.

As seen in FIG. 10, cells treated with increasing concentrations of Compound 5 (FIG. 10a ) and Compound 27 (FIG. 10b ) contain progressively more SMN1 minigene FL mRNA and less SMN1 minigene Δ7 mRNA, indicating a correction of SMN1 alternative splicing.

Without regard to whether a document cited herein was specifically and individually indicated as being incorporated by reference, all documents referred to herein are incorporated by reference into the present application for any and all purposes to the same extent as if each individual reference was fully set forth herein.

Although certain embodiments have been described in detail above, those having ordinary skill in the art will clearly understand that many modifications are possible in the embodiments without departing from the teachings thereof. All such modifications are intended to be encompassed within the claims as described herein. 

What is claimed is:
 1. A compound of Formula (IIa1) or Formula (IIIa1), respectively:

or a free acid, free base, salt, stereoisomer, racemate, enantiomer, diastereomer or tautomer thereof, wherein R₁ is heterocyclyl optionally substituted with one, two or three R₃ substituents and optionally, with one additional R₄ substituent, or optionally substituted with one, two, three or four R₃ substituents; R₂ is heteroaryl optionally substituted with one, two or three R₆ substituents and optionally, with one additional R₇ substituent; R_(a) is hydrogen; R_(b) is hydrogen; R₃ is, in each instance, independently selected from cyano, halogen, hydroxy, oxo, C₁₋₈alkyl, halo-C₁₋₈alkyl, C₁₋₈alkyl-carbonyl, C₁₋₈alkoxy, halo-C₁₋₈alkoxy, C₁₋₈alkoxy-C₁₋₈alkyl, C₁₋₈alkoxy-carbonyl, amino, C₁₋₈alkyl-amino, (C₁₋₈alkyl)₂-amino, amino-C₁₋₈alkyl, C₁₋₈alkyl-amino-C₁₋₈alkyl, (C₁₋₈alkyl)₂-amino-C₁₋₈alkyl, amino-C₁₋₈alkyl-amino, C₁₋₈alkyl-amino-C₁₋₈alkyl-amino, (C₁₋₈alkyl-amino-C₁₋₈alkyl)₂-amino, (C₁₋₈alkyl)₂-amino-C₁₋₈alkyl-amino, [(C₁₋₈alkyl)₂-amino-C₁₋₈alkyl]₂-amino, (C₁₋₈alkyl-amino-C₁₋₈alkyl)(C₁₋₈alkyl)amino, [(C₁₋₈alkyl)₂-amino-C₁₋₈alkyl](C₁₋₈alkyl)amino, C₁₋₈alkoxy-C₁₋₈alkyl-amino, (C₁₋₈alkoxy-C₁₋₈alkyl)₂-amino, (C₁₋₈alkoxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino, C₁₋₈alkyl-carbonyl-amino, C₁₋₈alkoxy-carbonyl-amino, hydroxy-C₁₋₈alkyl, hydroxy-C₁₋₈alkoxy-C₁₋₈alkyl, hydroxy-C₁₋₈alkyl-amino, (hydroxy-C₁₋₈alkyl)₂-amino or (hydroxy-C₁₋₈alkyl)(C₁₋₈alkyl)amino; R₄ is C₃₋₁₄cycloalkyl, C₃₋₁₄cycloalkyl-C₁₋₈alkyl, C₃₋₁₄cycloalkyl-amino, aryl-C₁₋₈alkyl, aryl-C₁₋₈alkoxy-carbonyl, aryl-sulfonyloxy-C₁₋₈alkyl, heterocyclyl or heterocyclyl-C₁₋₈alkyl; wherein, each instance of C₃₋₁₄cycloalkyl, aryl and heterocyclyl is optionally substituted with one, two or three R₅ substituents; R₅ is, in each instance, independently selected from halogen, hydroxy, cyano, nitro, C₁₋₈alkyl, halo-C₁₋₈alkyl, C₁₋₈alkoxy, halo-C₁₋₈alkoxy, amino, C₁₋₈alkyl-amino, (C₁₋₈alkyl)₂-amino or C₁₋₈alkyl-thio; R₆ is, in each instance, independently selected from halogen, hydroxy, cyano, nitro, C₁₋₈alkyl, C₂₋₈alkenyl, halo-C₁₋₈alkyl, hydroxy-C₁₋₈alkyl, C₁₋₈alkoxy, halo-C₁₋₈alkoxy, C₁₋₈alkoxy-C₁₋₈alkyl, amino, C₁₋₈alkyl-amino, (C₁₋₈alkyl)₂-amino or C₁₋₈alkyl-thio; and, R₇ is C₃₋₁₄cycloalkyl, C₃₋₁₄cycloalkyl-oxy, aryl, heterocyclyl or heteroaryl.
 2. The compound of claim 1, wherein the salt form is a chloride, hydrobromide, hydrochloride, dihydrochloride, acetate, trifluoroacetate or trifluoroacetic acid salt.
 3. The compound of claim 1, wherein the compound is selected from the group consisting of: 3-(1,3-benzothiazol-2-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(4-chloro-1,3-benzothiazol-2-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(1,3-benzothiazol-2-yl)-7-(4-methylpiperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(1,3-benzothiazol-2-yl)-7-[4-(2-chloroethyl)piperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 3-(4-chloro-1,3-benzothiazol-2-yl)-7-(4-methylpiperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(4-chloro-1,3-benzothiazol-2-yl)-7-[4-(2-hydroxybenzyl)piperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one tert-butyl 4-[3-(1,3-benzothiazol-2-yl)-2-oxo-2H-pyrano[3,2-c]pyridin-7-yl]piperazine-1-carboxylate tert-butyl 4-[3-(4-chloro-1,3-benzothiazol-2-yl)-2-oxo-2H-pyrano[3,2-c]pyridin-7-yl]piperazine-1-carboxylate 3-(4-chloro-1,3-benzothiazol-2-yl)-7-(piperazin-1-yl)-2H-pyrano[3,2-c]pyridin-2-one 3-(4-chloro-1,3-benzothiazol-2-yl)-7-[4-(2-hydroxyethyl)piperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 3-(4-chloro-1,3-benzothiazol-2-yl)-7-(4-methylpiperazin-1-yl)-2H-pyrano[3,2-c]pyridin-2-one 3-(4-chloro-1,3-benzothiazol-2-yl)-7-(4-ethylpiperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(4-chloro-1,3-benzothiazol-2-yl)-7-(4-propylpiperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(1,3-benzothiazol-2-yl)-7-(4-methylpiperazin-1-yl)-2H-pyrano[3,2-c]pyridin-2-one 3-(4-methyl-1,3-thiazol-2-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-(piperazin-1-yl)-3-[4-(trifluoromethyl)-1,3-thiazol-2-yl]-2H-pyrano[2,3-b]pyridin-2-one 3-(1,3-benzothiazol-2-yl)-7-(4-ethylpiperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(1,3-benzothiazol-2-yl)-7-(4-propylpiperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(1,3-benzothiazol-2-yl)-7-[4-(propan-2-yl)piperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 7-(4-ethylpiperazin-1-yl)-3-(4-methyl-1,3-thiazol-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(4-methyl-1,3-thiazol-2-yl)-7-(4-propylpiperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(4-chloro-1,3-benzothiazol-2-yl)-7-[4-(2,3-dihydroxypropyl)piperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 3-(4-chloro-1,3-benzothiazol-2-yl)-7-[4-(propan-2-yl)piperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 3-(6-methylimidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(1,3-benzothiazol-2-yl)-7-[4-(2-hydroxyethyl)piperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 3-(1,3-benzothiazol-2-yl)-7-[4-(2,3-dihydroxypropyl)piperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 3-(6-methylimidazo[1,2-a]pyridin-2-yl)-7-(4-methylpiperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(imidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(7-methylimidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-(1,4-diazepan-1-yl)-3-(imidazo[1,2-a]pyrimidin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(4-chloro-1,3-benzothiazol-2-yl)-7-(1,4-diazepan-1-yl)-2H-pyrano[2,3-a]pyridin-2-one 7-(1,4-diazepan-1-yl)-3-(imidazo[2,1-b][1,3]thiazol-6-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(6-methylimidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[3,2-c]pyridin-2-one 3-(6-methylimidazo[1,2-a]pyridin-2-yl)-7-(4-methylpiperazin-1-yl)-2H-pyrano[3,2-c]pyridin-2-one 3-(8-chloro-6-methylimidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[3,2-c]pyridin-2-one 3-(imidazo[1,2-a]pyrimidin-2-yl)-7-(4-methyl-1,4-diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(4-chloro-1,3-benzothiazol-2-yl)-7-(4-methyl-1,4-diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(imidazo[1,2-a]pyridin-2-yl)-7-(4-methylpiperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(7-methylimidazo[1,2-a]pyridin-2-yl)-7-(4-methylpiperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(7-methylimidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[3,2-c]pyridin-2-one 3-(2-methylimidazo[2,1-b][1,3]thiazol-6-yl)-7-(piperazin-1-yl)-2H-pyrano[3,2-c]pyridin-2-one 3-(imidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[3,2-c]pyridin-2-one 3-(5-methylpyrazolo[1,5-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(imidazo[2,1-b][1,3]thiazol-6-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-(1,4-diazepan-1-yl)-3-(imidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-(1,4-diazepan-1-yl)-3-(8-fluoroimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(8-chloroimidazo[1,2-a]pyridin-2-yl)-7-(1,4-diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(imidazo[1,2-a]pyridin-2-yl)-7-(4-methyl-1,4-diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(8-fluoroimidazo[1,2-a]pyridin-2-yl)-7-(4-methyl-1,4-diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(8-chloroimidazo[1,2-a]pyridin-2-yl)-7-(4-methyl-1,4-diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(1,3-benzothiazol-2-yl)-7-(1,4-diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(1,3-benzoxazol-2-yl)-7-(1,4-diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-(4-methylpiperazin-1-yl)-3-(5-methylpyrazolo[1,5-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(imidazo[2,1-b][1,3]thiazol-6-yl)-7-(4-methylpiperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(2-methylimidazo[2,1-b][1,3]thiazol-6-yl)-7-(4-methylpiperazin-1-yl)-2H-pyrano[3,2-c]pyridin-2-one 3-(1,3-benzothiazol-2-yl)-7-(4-methyl-1,4-diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(7-methylimidazo[1,2-a]pyridin-2-yl)-7-(4-methylpiperazin-1-yl)-2H-pyrano[3,2-c]pyridin-2-one 3-(7-methylimidazo[1,2-a]pyridin-2-yl)-7-[(3S)-3-methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 3-(7-methylimidazo[1,2-a]pyridin-2-yl)-7-[(2S)-2-methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 7-[(3R,5S)-3,5-dimethylpiperazin-1-yl]-3-(imidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-[(3S)-3,4-dimethylpiperazin-1-yl]-3-(7-methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-[(2S)-2,4-dimethylpiperazin-1-yl]-3-(7-methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(8-fluoroimidazo[1,2-a]pyridin-2-yl)-7-[(2S)-2-methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 3-(8-fluoroimidazo[1,2-a]pyridin-2-yl)-7-[(3S)-3-methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 7-(1,4-diazepan-1-yl)-3-(7-methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-(1,4-diazepan-1-yl)-3-(6-methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-[(3R,5S)-3,5-dimethylpiperazin-1-yl]-3-(6-methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-[(2S)-2,4-dimethylpiperazin-1-yl]-3-(8-fluoroimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-[(3S)-3,4-dimethylpiperazin-1-yl]-3-(8-fluoroimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(4-chloro-1,3-benzothiazol-2-yl)-7-[(3R,5S)-3,5-dimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 3-(4-chloro-1,3-benzothiazol-2-yl)-7-[(3R,5S)-3,4,5-trimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 3-(6-methylimidazo[1,2-a]pyridin-2-yl)-7-[(3S)-3-methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 3-(6-methylimidazo[1,2-a]pyridin-2-yl)-7-[(3R)-3-methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 7-[(3S)-3,4-dimethylpiperazin-1-yl]-3-(6-methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-[(3R)-3,4-dimethylpiperazin-1-yl]-3-(6-methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-[(3R,5S)-3,5-dimethylpiperazin-1-yl]-3-(8-fluoroimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(8-chloroimidazo[1,2-a]pyridin-2-yl)-7-[(3R,5S)-3,5-dimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 7-[(3R,5S)-3,5-dimethylpiperazin-1-yl]-3-(imidazo[1,2-a]pyrimidin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(imidazo[1,2-a]pyridin-2-yl)-7-[(3S)-3-methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 3-(imidazo[1,2-a]pyridin-2-yl)-7-[(3R)-3-methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 7-[(3S)-3,4-dimethylpiperazin-1-yl]-3-(imidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-[(3R)-3,4-dimethylpiperazin-1-yl]-3-(imidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(imidazo[2,1-b][1,3]thiazol-6-yl)-7-[(3S)-3-methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 3-(imidazo[2,1-b][1,3]thiazol-6-yl)-7-[(3R)-3-methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 3-(4-chloro-1,3-benzothiazol-2-yl)-7-[(2R,5S)-2,5-dimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 3-(4-chloro-1,3-benzothiazol-2-yl)-7-[(2R,5S)-2,4,5-trimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 7-[(2R,5S)-2,5-dimethylpiperazin-1-yl]-3-(6-methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-[(2R,5S)-2,5-dimethylpiperazin-1-yl]-3-(7-methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-(1,4-diazepan-1-yl)-3-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)-7-[(3R,5S)-3,5-dimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyri din-2-one 3-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)-7-(4-methyl-1,4-diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-[(2R,5S)-2,5-dimethylpiperazin-1-yl]-3-(8-fluoroimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(6-methylimidazo[1,2-a]pyridin-2-yl)-7-[(2R,5S)-2,4,5-trimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 3-(8-chloroimidazo[1,2-a]pyridin-2-yl)-7-[(2R,5S)-2,5-dimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 3-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)-7-[(2R,5S)-2,5-dimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 3-(7-methylimidazo[1,2-a]pyridin-2-yl)-7-[(2R,5S)-2,4,5-trimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 3-(8-fluoroimidazo[1,2-a]pyridin-2-yl)-7-[(2R,5S)-2,4,5-trimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 3-(8-chloroimidazo[1,2-a]pyridin-2-yl)-7-[(2R,5S)-2,4,5-trimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 7-[(3R,5S)-3,5-dimethylpiperazin-1-yl]-3-(7-methylimidazo[1,2-a]pyrimidin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-[(3R,5S)-3,5-dimethylpiperazin-1-yl]-3-(7-methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-[(3R,5S)-3,5-dimethylpiperazin-1-yl]-3-(6-methylimidazo[1,2-a]pyrazin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-[(2R,5S)-2,5-dimethylpiperazin-1-yl]-3-(6-methylimidazo[1,2-a]pyrazin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(6-methylimidazo[1,2-a]pyrazin-2-yl)-7-[(2R,5S)-2,4,5-trimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 7-(1,4-diazepan-1-yl)-3-(6-methylimidazo[1,2-a]pyrazin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-(4-methyl-1,4-diazepan-1-yl)-3-(6-methylimidazo[1,2-a]pyrazin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-[(3R,5S)-3,5-dimethylpiperazin-1-yl]-3-(8-fluoro-6-methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-(1,4-diazepan-1-yl)-3-(8-fluoro-6-methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(8-fluoroimidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(8-chloroimidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(8-fluoroimidazo[1,2-a]pyridin-2-yl)-7-(4-methylpiperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(8-chloroimidazo[1,2-a]pyridin-2-yl)-7-(4-methylpiperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(imidazo[1,2-a]pyrimidin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(8-fluoro-6-methylimidazo[1,2-a]pyridin-2-yl)-7-(4-methyl-1,4-diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(imidazo[2,1-b][1,3]thiazol-6-yl)-7-(4-methyl-1,4-diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-(4-methyl-1,4-diazepan-1-yl)-3-(7-methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-(4-methyl-1,4-diazepan-1-yl)-3-(6-methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(imidazo[1,2-a]pyrimidin-2-yl)-7-(4-methylpiperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(imidazo[1,2-a]pyrimidin-2-yl)-7-[(3R,5S)-3,4,5-trimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 3-(8-fluoroimidazo[1,2-a]pyridin-2-yl)-7-[(3R,5S)-3,4,5-trimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 3-(8-chloroimidazo[1,2-a]pyridin-2-yl)-7-[(3R,5S)-3,4,5-trimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 3-(imidazo[1,2-a]pyridin-2-yl)-7-[(3R,5S)-3,4,5-trimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 7-[(2R,5S)-2,5-dimethylpiperazin-1-yl]-3-(8-fluoro-6-methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)-7-[(2R,5S)-2,4,5-trimethylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 7-[(1S,4S)-2,5-diazabicyclo[2.2.1]hept-2-yl]-3-(6-methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-[(1S,4S)-5-methyl-2,5-diazabicyclo[2.2.1]hept-2-yl]-3-(6-methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-(4-ethyl-1,4-diazepan-1-yl)-3-(imidazo[1,2-a]pyrimidin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-(4-ethyl-1,4-diazepan-1-yl)-3-(imidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)-7-(4-ethyl-1,4-diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-[(3R,5S)-4-ethyl-3,5-dimethylpiperazin-1-yl]-3-(imidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-(4-ethylpiperazin-1-yl)-3-(6-methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-(4-ethylpiperazin-1-yl)-3-(7-methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-(4-ethylpiperazin-1-yl)-3-(8-fluoroimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(8-chloroimidazo[1,2-a]pyridin-2-yl)-7-(4-ethylpiperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-(4-ethylpiperazin-1-yl)-3-(8-fluoro-6-methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-[(1S,4S)-2,5-diazabicyclo[2.2.1]hept-2-yl]-3-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-[(1S,4S)-2,5-diazabicyclo[2.2.1]hept-2-yl]-3-(8-fluoro-6-methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-[(3S)-4-ethyl-3-methylpiperazin-1-yl]-3-(8-fluoro-6-methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-(4-ethyl-1,4-diazepan-1-yl)-3-(8-fluoro-6-methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-(4-ethyl-1,4-diazepan-1-yl)-3-(8-fluoroimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)-7-(4-ethylpiperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(8-chloroimidazo[1,2-a]pyridin-2-yl)-7-(4-ethyl-1,4-diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-(4-ethyl-1,4-diazepan-1-yl)-3-(6-methylimidazo[1,2-a]pyrazin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 7-[(3S)-4-ethyl-3-methylpiperazin-1-yl]-3-(6-methylimidazo[1,2-a]pyrazin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one 3-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)-7-[(3S)-4-ethyl-3-methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one 3-(8-chloroimidazo[1,2-a]pyridin-2-yl)-7-[(3S)-4-ethyl-3-methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one, or 3-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)-7-[(3S)-3-methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one or a salt, stereoisomer, racemate, enantiomer, diastereomer or tautomer thereof.
 4. The compound of claim 2, wherein a salt form of the compound is selected from: 3-(4-chloro-1,3-benzothiazol-2-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one hydrochloride 3-(4-chloro-1,3-benzothiazol-2-yl)-7-(piperazin-1-yl)-2H-pyrano[3,2-c]pyridin-2-one hydrochloride 3-(4-methyl-1,3-thiazol-2-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one hydrochloride 7-(piperazin-1-yl)-3-[4-(trifluoromethyl)-1,3-thiazol-2-yl]-2H-pyrano[2,3-b]pyridin-2-one hydrochloride 3-(6-methylimidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one hydrochloride 3-(imidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one hydrochloride 3-(7-methylimidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one hydrochloride 7-(1,4-diazepan-1-yl)-3-(imidazo[1,2-a]pyrimidin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one hydrochloride 3-(4-chloro-1,3-benzothiazol-2-yl)-7-(1,4-diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one hydrochloride 7-(1,4-diazepan-1-yl)-3-(imidazo[2,1-b][1,3]thiazol-6-yl)-2H-pyrano[2,3-b]pyridin-2-one hydrochloride 3-(8-chloro-6-methylimidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[3,2-c]pyridin-2-one hydrochloride 3-(7-methylimidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[3,2-c]pyridin-2-one hydrochloride 3-(2-methylimidazo[2,1-b][1,3]thiazol-6-yl)-7-(piperazin-1-yl)-2H-pyrano[3,2-c]pyridin-2-one hydrochloride 3-(imidazo[1,2-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[3,2-c]pyridin-2-one hydrochloride 3-(5-methylpyrazolo[1,5-a]pyridin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one hydrochloride 3-(imidazo[2,1-b][1,3]thiazol-6-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one hydrochloride 7-(1,4-diazepan-1-yl)-3-(imidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one hydrochloride 7-(1,4-diazepan-1-yl)-3-(8-fluoroimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one hydrochloride 3-(8-chloroimidazo[1,2-a]pyridin-2-yl)-7-(1,4-diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one hydrochloride 3-(1,3-benzothiazol-2-yl)-7-(1,4-diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one hydrochloride 3-(1,3-benzoxazol-2-yl)-7-(1,4-diazepan-1-yl)-2H-pyrano[2,3-b]pyridin-2-one hydrochloride 3-(imidazo[1,2-a]pyridin-2-yl)-7-[(3S)-3-methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one hydrochloride 3-(imidazo[1,2-a]pyridin-2-yl)-7-[(3R)-3-methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one hydrochloride 3-(imidazo[2,1-b][1,3]thiazol-6-yl)-7-[(3S)-3-methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one hydrochloride 3-(imidazo[2,1-b][1,3]thiazol-6-yl)-7-[(3R)-3-methylpiperazin-1-yl]-2H-pyrano[2,3-b]pyridin-2-one hydrochloride 7-(1,4-diazepan-1-yl)-3-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one hydrochloride 7-(1,4-diazepan-1-yl)-3-(6-methylimidazo[1,2-a]pyrazin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one hydrochloride 7-(1,4-diazepan-1-yl)-3-(8-fluoro-6-methylimidazo[1,2-a]pyridin-2-yl)-2H-pyrano[2,3-b]pyridin-2-one hydrochloride, or 3-(imidazo[1,2-a]pyrimidin-2-yl)-7-(piperazin-1-yl)-2H-pyrano[2,3-b]pyridin-2-one hydrochloride or a stereoisomer, racemate, enantiomer, diastereomer or tautomer thereof.
 5. A pharmaceutical composition comprising an effective amount of the compound of claim 1 and a pharmaceutically acceptable carrier, excipient or diluent. 